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úìéà ìù éðéì÷ìà-÷ì÷ä èéðøâä ìù äæðâåøèôä 

ïîñééå úìééà 

2010 éðåé ,ò"ùú æåîú ,íéìùåøé 

GSI/16/2010 ’ñî çåã

משרד התשתיות הלאומיות 

המכון הגיאולוגי 

הפטרוגנזה של הגרניט הקלק-אלקליני של אילת 

איילת וייסמן 

עבודת זו הוגשה כחיבור לקבלת תואר ‏"מוסמך במדעי הטבע"‏ במחלקה לגיאולוגיה,‏ 

המכון למדעי כדור הארץ,‏ הפקולטה למדעי הטבע,‏ האוניברסיטה העברית,‏ ירושלים.‏ 

העבודה נעשתה בהדרכתם של:‏ 

פרופ'‏ עודד נבון,‏ המחלקה לגיאולוגיה,‏ המכון למדעי כדור הארץ,‏ האוניברסיטה העברית,‏ ירושלים 

ד"ר מרדכי שטיין,‏ המכון הגיאולוגי הישראלי,‏ ירושלים 

ד"ר רונית קסל,‏ המחלקה לגיאולוגיה,‏ המכון למדעי כדור הארץ,‏ האוניברסיטה העברית,‏ ירושלים 

דוח מס'‏ GSI/16/2010 

ירושלים,‏ 

תמוז תש"ע,‏ 

יוני 2010

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standard 

Analysis of the 

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Analysis of 

the standard 

Sample NIM-G* NIM-G (3) BHVO-1** BHVO-1 (2) 

wt% 

SiO 2 75.70 78.33 ± 1.29 49.9 50.05 

TiO 2 0.09 0.09 ± 0.00 2.71 2.69 

Al 2 O 3 12.08 11.20 ± 0.35 13.8 12.35 

Fe 2 O 3 * 2.02 1.74 ± 0.01 12.2 10.80 

MgO 0.06 0.04 ± 0.01 7.23 6.72 

MnO 0.02 0.01 ± 0.00 0.17 0.15 

CaO 0.78 0.78 ± 0.01 11.4 10.65 

Na 2 O 3.36 3.18 ± 0.22 2.26 2.11 

K 2 O 4.99 5.11 ± 0.19 0.52 0.54 

P 2 O 5 0.01 0.01 ± 0.06 0.27 0.29 

SO 3 0.01 ± 0.01 0.15 

Total 100.50 ± 1.94 96.49 

ppm 

Sr 10.00 9.90 ± 0.35 403 339.70 

Ba 120.00 116.10 ± 4.39 139 133.55 

Zr .00 284.93 ± 0.99 179 151.45 

* Steele et al., 1978. 

** Flanagan, 1976. 

 

 

 

 

 

 

 

 

 

 

 

 

 

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2

! 

sample AD-S-1 AD-S-3 AD-S-4 AD-S-5 AD-S-5-H AD-S-6 

location Shchoret Shchoret Shchoret Shchoret Shchoret Shchoret 

rock type granite m. xenolith m. xenolith m. xenolith granite granite 

source (a) PS PS PS PS PS PS 

wt% 

SiO 2 72.70 47.50 59.00 58.10 72.50 74.40 

TiO 2 0.38 1.07 1.08 1.19 0.36 0.27 

Al 2 O 3 11.90 15.90 15.50 14.90 13.60 12.90 

Fe 2 O 3 * (b) 2.73 9.50 5.08 6.30 2.13 1.61 

CaO 1.82 7.96 4.67 4.46 2.01 1.14 

MgO 0.49 7.06 2.51 3.40 0.81 0.64 

MnO 0.28 0.18 0.18 0.19 0.04 0.04 

Na 2 O 3.96 2.56 5.40 4.36 4.11 3.96 

K 2 O 4.01 1.60 0.96 1.70 3.26 4.36 

P 2 O 5 0.08 0.26 0.32 0.35 0.09 0.08 

L.O.I (c) 1.65 2.13 3.41 2.67 0.73 0.78 

Total 100.72 97.33 98.94 98.71 100.20 100.59 

Mg# (d) 0.32 0.63 0.54 0.56 0.50 0.51 

ppm 

Cs 1.5 2.3 3.8 2.1 1 1.6 

Rb 71 42 43 58 46 70 

Ba 1009 334 120 507 2246 1124 

Th 6.1 0.9 8.9 4 1.6 3.1 

U 1.1 0.6 2.6 1.7 0.9 1 

Nb 7 6 28 26 5 9 

La 34 9 28 28 9 12 

Ce 67 20 55 64 18 24 

Pb 12 4 20 8 12 10 

Pr 7.3 2.9 6.8 9.7 2.2 3 

Sr 167 274 339 393 427 293 

Nd 25 13 25 40 9 11 

Sm 4.3 3.1 5.1 9.4 1.6 2.2 

Zr 244 88 225 147 113 89 

Eu 0.9 1 1 1.2 1 0.5 

Gd 3.8 3.1 4.3 7.8 1.4 1.8 

Tb 0.6 0.6 0.7 1.4 0.2 0.3 

Y 18 19 26 48 7 10 

Dy 3.1 3.4 3.8 8.2 1.1 1.7 

Ho 0.6 0.6 0.7 1.5 0.2 0.3 

Er 1.8 2 2.4 4.7 0.7 0.9 

Tm 0.3 0.3 0.4 0.7 0.1 0.2 

Yb 1.7 1.8 2.7 4.4 0.7 1.0 

Lu 0.2 0.3 0.4 0.6 0.1 0.1 

V 33 220 110 97 30 24 

Cr 150 210 70 120 230 245 

Co 3 40 15 17 6 4 

Ni 10 93 20 37 500 570 

Cu 7 18 18 19 5 5 

Zn 80 115 135 155 130 70 

Ga 26 13 14 19 48 26 

Eu/Eu*(e) 0.68 0.99 0.65 0.43 2.05 0.77 

(a) Source: PS=present study; Kessel= Kessel et al., 1998; Eyal= Eyal et al, 2004; 

Katz= Katz, 1996; Beyth= Beyth et al., 1994; Stein= Stein, unpublished data. 

(b) Total Fe as Fe 2O 3 

Fe2O3* from Stein, Beyth & Katz calculated as (FeO*/0.89981) 

(c) LOI=Loss on Ignition 

(d) Mg# = MgO/(MgO+FeO) molar 

(e) Eu anomaly calculated as 

Eu/(Sm*Gd)^0.5 

 

 

1

sample AD-S-7 AD-S-8 AD-N-10 AD-N-11 AD-N-15 AD-E-17 

location Shchoret Shchoret Netafim Netafim Netafim Elat 

rock type m. xenolith m. xenolith m. xenolith m. xenolith m. xenolith Elat granite 

source PS PS PS PS PS PS 

wt% 

SiO 2 54.10 49.40 52.10 56.90 49.40 76.30 

TiO 2 1.52 0.58 1.32 1.21 1.68 0.15 

Al 2 O 3 15.90 19.60 15.10 13.30 14.90 13.00 

Fe 2 O 3 * 8.46 6.43 8.91 9.00 11.80 1.20 

CaO 6.75 9.73 7.94 8.54 8.32 0.46 

MgO 3.20 4.62 5.39 3.50 4.59 0.40 

MnO 0.18 0.11 0.12 0.10 0.25 0.02 

Na 2 O 4.42 2.52 3.88 4.70 3.62 4.75 

K 2 O 1.49 2.07 1.22 0.82 1.17 3.51 

P 2 O 5 0.46 0.10 0.29 0.28 0.19 0.03 

L.O.I 1.73 1.66 0.99 0.28 0.84 0.69 

Total 99.59 97.91 98.73 100.11 98.63 100.82 

Mg# 0.47 0.63 0.59 0.48 0.48 0.47 

ppm 

Cs 2 4.8 1.1 0.3 2 1.7 

Rb 38 81 20 8 28 36 

Ba 546 548 500 231 314 846 

Th 0.7 0.6 1.5 1.0 1.5 2.2 

U 0.5 0.3 0.6 0.3 0.5 0.6 

Nb 25 3 8 7 5 5 

La 27 5 15 18 10 7 

Ce 64 10 33 40 22 14 

Pb 8 7 10 11 16 6 

Pr 9.5 1.5 4.6 5.8 3.3 1.7 

Sr 629 311 572 927 409 304 

Nd 39 7 19 25 16 6 

Sm 8.5 1.8 4.2 5.0 4.3 1.0 

Zr 156 28 81 105 158 84 

Eu 1.6 0.6 1.1 1.1 1.3 0.2 

Gd 7.6 1.8 3.8 4.2 4.3 0.8 

Tb 1.3 0.4 0.7 0.7 0.8 0.1 

Y 44 12 22 18 31 3 

Dy 7.5 2.1 3.7 3.4 5.3 0.5 

Ho 1.4 0.4 0.7 0.6 1.0 0.1 

Er 4.4 1.3 2.1 1.8 3.3 0.3 

Tm 0.7 0.2 0.3 0.3 0.5 0.0 

Yb 4.1 1.3 1.9 1.6 3.1 0.3 

Lu 0.6 0.2 0.3 0.2 0.5 0.0 

V 185 150 220 225 270 13 

Cr 70 230 145 245 50 150 

Co 27 30 37 24 45 2 

Ni 180 46 35 36 17 7 

Cu 35 7 160 20 22 6 

Zn 135 78 100 77 210 63 

Ga 21 16 18 14 14 24 

Eu/Eu* 0.61 1.02 0.84 0.71 0.92 0.74

sample AD-E-18 AW-Sh-1 AW-Sh-1 a AW-Sh-1 b AW-Sh-4 AW-Sh-6 

location Elat Shlomo Shlomo Shlomo Shlomo Shlomo 

rock type Elat granite Elat granite Elat granite Elat granite Elat granite Elat granite 


wt% 

SiO 2 76.20 73.80 73.70 75.80 73.20 72.40 

TiO 2 0.14 0.10 0.10 0.10 0.10 0.10 

Al 2 O 3 12.90 13.60 13.90 13.30 14.30 14.60 

Fe 2 O 3 * 1.81 1.70 1.30 1.50 1.40 1.30 

CaO 0.37 0.60 0.60 0.60 1.00 1.10 

MgO 0.38 0.40 0.40 0.40 0.40 0.50 

MnO 0.02 0.03 0.03 0.02 0.03 0.03 

Na 2 O 4.72 4.90 5.30 4.70 5.00 4.60 

K 2 O 3.74 3.70 3.50 3.60 3.60 4.00 

P 2 O 5 0.07

sample AW-AL- 9 AW-Sh-10 AW-Sh-11 AW-Sh-12 AW-Sh-13 AW-Sh-15 

location Almog Shlomo Shlomo Shlomo Shlomo Shlomo 



wt% 

SiO 2 74.50 72.10 74.80 73.80 73.20 72.90 

TiO 2 0.09 0.30 0.20 0.10 0.10 0.10 

Al 2 O 3 13.60 14.20 13.10 14.30 14.10 14.30 

Fe 2 O 3 * 0.80 2.20 2.30 1.30 1.40 1.40 

CaO 0.70 0.90 1.00 1.00 1.10 0.60 

MgO 0.20 0.50 0.30 0.50 0.50 0.40 

MnO 0.01 0.04 0.04 0.04 0.04 0.03 

Na 2 O 4.10 4.70 4.50 4.60 4.80 4.90 

K 2 O 4.50 4.20 3.20 3.80 3.30 4.20 

P 2 O 5

sample AW-R-16 AW-R-17 AW-E-25 AW-E-26 AW-E-27 AW-E-28 

location Roded Roded Elat Elat Elat Elat 



 

wt% 

SiO 2 72.70 72.70 74.50 73.80 72.70 73.70 

TiO 2 0.10 0.10 0.09 0.20 0.20 0.10 

Al 2 O 3 14.60 14.50 13.70 14.30 15.00 14.30 

Fe 2 O 3 * 1.30 1.20 0.90 1.40 1.20 1.00 

CaO 1.10 0.80 0.80 0.70 1.10 0.80 

MgO 0.30 0.30 0.30 0.40 0.40 0.40 

MnO 0.03 0.03 0.02 0.02 0.03 0.03 

Na 2 O 4.80 4.70 4.40 4.90 5.20 4.70 

K 2 O 3.90 4.30 3.80 4.00 3.50 3.90 

P 2 O 5

sample AW-R-18 h AW-R-22 h AW-R-18 x AW-R-19 x AW-R-20 a AW-R-20 x 

location Roded Roded Roded Roded Roded Roded 

rock type q-diorite q-diorite m. xenolithe m. xenolithe m. xenolithe m. xenolithe 


wt% 

SiO 2 58.00 59.10 51.00 51.00 50.20 49.00 

TiO 2 0.90 0.80 1.50 1.00 1.30 1.30 

Al 2 O 3 16.50 16.20 17.90 16.80 18.40 18.60 

Fe 2 O 3 * 5.70 6.10 9.10 8.50 9.80 10.00 

CaO 5.30 5.30 6.60 9.90 8.00 8.50 

MgO 4.20 4.30 4.20 7.30 5.50 5.80 

MnO 0.08 0.09 0.12 0.13 0.15 0.15 

Na 2 O 4.80 4.80 5.10 3.50 4.20 4.10 

K 2 O 1.70 1.60 1.40 1.30 1.20 1.20 

P 2 O 5 0.40 0.30 0.30 0.20 0.30 0.40 

L.O.I 1.20 1.60 1.30 1.40 1.30 1.20 

Total 98.78 100.19 98.52 101.03 100.35 100.25 

Mg# 0.63 0.62 0.52 0.67 0.57 0.57 

ppm 

Cs 1.0 1.1 1.1 1.0 1.1 1.0 

Rb 30 31 33 21 18 23 

Ba 692 630 504 602 463 642 

Th 2.3 7.4 2.9 1.0 1.1 0.9 

U 1.1 1.7 0.7 0.6 1.1 0.4 

Nb 

La 22 20 15 7.5 14 16 

Ce 44 42 34 16 31 37 

Pb 9.7 8.2 6.4 3.8 5.7 4.1 

Pr 6.0 6.1 5.0 2.4 4.5 5.4 

Sr 756 905 716 427 516 628 

Nd 24 24 20 10 18 22 

Sm 4.7 4.3 3.7 2.4 3.7 4.5 

Zr 150 140 200 80 180 170 

Eu 1.0 1.0 0.8 0.6 0.9 1.1 

Gd 4.3 3.4 2.9 2.3 3.4 4.1 

Tb 0.64 0.43 0.40 0.37 0.51 0.62 

Y 19 10 10 11 16 19 

Dy 3.6 2.2 2.0 2.2 2.9 3.6 

Ho 0.65 0.36 0.33 0.38 0.52 0.64 

Er 1.97 1.09 0.99 1.17 1.61 2.01 

Tm 0.24 0.13 0.12 0.15 0.21 0.26 

Yb 1.80 0.96 0.91 1.06 1.55 1.91 

Lu 0.24 0.12 0.12 0.13 0.21 0.25 

Cr 60 335 264 128 83 137 

Co 22 19 15 28 23 29 

Ni 13 520 440 40 29 35 

Cu 200 34 22 76 110 46 

Zn 98 92 68 67 80 98 

Ga 21 20 16 13 17 21 

Eu/Eu* 0.67 0.76 0.71 0.79 0.79 0.79 

 

 

)

sample AW-R-21 x AW-R-22 x AW-R-23 x AW-R-24 x AW-Sh-14 AW-MY- 3 

location Roded Roded Roded Roded Shlomo Maale Y. 

rock type m. xenolithe m. xenolithe m. xenolithe m. xenolithe Y. granite Y. granite 


wt% 

SiO 2 52.20 55.50 48.00 53.20 74.60 74.20 

TiO 2 1.30 1.00 1.70 1.30 0.10 0.10 

Al 2 O 3 18.10 18.90 19.60 16.60 12.50 14.30 

Fe 2 O 3 * 9.00 7.00 10.40 8.80 2.10 1.30 

CaO 7.50 3.30 8.00 7.60 0.30 0.60 

MgO 4.40 3.50 4.30 4.40 0.20 0.40 

MnO 0.15 0.12 0.13 0.14 0.12 0.03 

Na 2 O 5.20 6.80 4.10 4.90 4.50 5.20 

K 2 O 0.80 1.20 1.50 0.90 4.60 3.50 

P 2 O 5 0.30 0.20 0.40 0.20

sample AW- Y- 5 AW-AL- 8 AW-AL- 7 ET16 ET20 A29 

location Yehoshafat Almog Almog Elat Elat Shlomo 

rock type Y. granite gniss pegmatite Elat granite Elat granite Elat granite 

source PS PS PS Kessel Kessel Eyal 

 

wt% 

SiO 2 75.20 74.10 77.00 73.90 75.00 74.70 

TiO 2 0.10 0.10

sample A38 OK117 OK98 OK118 ET-20-M UM-2 

location Rehavam Roded Roded Roded Elat Um Malek 

rock type Elat granite qz-diorite xenolith xenolith Elat granite alk-granite 

source Eyal Katz Katz Katz Stein Stein 

 

wt% 

SiO 2 72.50 67.20 53.10 58.50 76.00 72.29 

TiO 2 0.13 0.60 1.00 0.91 0.05 0.43 

Al 2 O 3 15.30 15.30 15.28 14.10 13.67 14.12 

Fe 2 O 3 * 1.07 3.45 8.45 6.56 0.12 1.54 

CaO 1.21 3.10 6.90 6.15 1.02 1.22 

MgO 0.28 1.84 7.40 6.20 0.01 0.43 

MnO 0.04 0.05 0.14 0.10 0.01 0.06 

Na 2 O 4.53 4.20 3.70 3.40 4.72 3.95 

K 2 O 4.45 1.90 1.30 1.40 3.48 4.67 

P 2 O 5 0.06 0.10 0.30 0.30 0.03 0.07 

L.O.I 0.89 1.50 1.90 1.30 

Total 100.40 98.90 98.30 97.90 99.29 99.33 

Mg# 0.97 0.55 0.67 0.69 0.18 0.42 

ppm 

Cs 3.3 

Rb 100 

Ba 800 816 576 714 

Th 4.5 

U 0.9 

Nb 7 

La 13.04 

Ce 27.64 

Pb 22 19 14 11 

Pr 3.19 

Sr 450 498 836 853 

Nd 11.84 

Sm 2.39 

Zr 67 

Eu 0.67 

Gd 2.01 

Tb 0.31 

Y 9 8 19 14 

Dy 1.77 

Ho 0.37 

Er 0.99 

Tm 0.15 

Yb 1.06 

Lu 0.16 

V 38 48 148 114 

Cr 156 400 327 

Co 15 37 30 

Ni 27 212 143 

Cu 5 23 121 1.7 

Zn 35 46 145 78 

Ga 22.8 

Eu/Eu* 0.92 

 

 

)-

sample MB207 MB211 RD-6 RD-15 RD-15-X RD-17-X ET-3 

location Timna Timna Roded Roded Roded Roded Elat 

rock type granophire granophire qz-diorite qz-diorite xenolith xenolith Elat amph. 

source Beyth Beyth Stein Stein Stein Stein Kessel 

wt% 

SiO 2 69.82 70.42 60.20 65.20 57.80 53.20 56.40 

TiO 2 0.26 0.25 0.75 0.86 1.63 1.38 1.24 

Al 2 O 3 16.16 16.37 13.10 15.90 15.60 16.90 18.00 

Fe 2 O 3 * 1.46 0.77 5.87 3.46 7.12 7.67 4.91 

CaO 2.36 2.20 6.20 4.83 7.06 7.92 7.11 

MgO 0.62 0.61 6.94 2.72 4.09 5.24 5.27 

MnO 0.02 0.02 0.13 0.07 0.15 14.00 0.08 

Na 2 O 5.57 5.64 3.65 5.08 4.71 4.34 3.79 

K 2 O 2.25 2.48 1.34 1.16 0.69 1.30 1.44 

P 2 O 5 0.08 0.09 0.12 0.14 0.09 0.02 0.02 

L.O.I 0.53 0.46 

Total 99.80 100.04 98.44 99.61 99.15 98.42 98.35 

Mg# 0.53 0.68 0.73 0.65 0.57 0.61 0.71 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

)2

# 

 

 

! ! ! 

! ! 

#Kessel et al., (1998)& #%'',$Beyth et al.& ( 

# #%''2$ 

Granite in N. Shchoret 

Xenoliths in N. Netafim 

1.2 1 

Roded qz-diorite 

Timna granite phorphyre 

Elat amphibolite 

Granitic gneiss 

0.8 

%$ 

Xenoliths in N. Shchoret 

Elat 0.6 granite 0.4 

0.2 

Xenoliths in Roded 

Um malek alk-granite 

Yehoshafat granite 

0 

0 

-0.2 

-0.4 

-0.6 

-0.8 

-1 

 

 

25 

20 

12 

10 

Al2O3 (wt%) 

15 

10 

5 

Fe total (wt%) 

8 

6 

4 

2 

0 

40 45 50 55 60 65 70 75 80 

SiO 2 (wt%) 

0 

40 45 50 55 60 65 70 75 80 

SiO 2 (wt%) 

10 

8 

CaO (wt%) 

9 

8 

7 

6 

5 

4 

3 

2 

1 

0 

40 45 50 55 60 65 70 75 80 

SiO 2 (wt%) 

MgO (wt%) 

7 

6 

5 

4 

3 

2 

1 

0 

40 45 50 55 60 65 70 75 80 

SiO 2 (wt%) 

)1

! !"! 

 

TiO 2 (wt%) 

K 2O (wt%) 

2 

1.8 

1.6 

1.4 

1.2 

1 

0.8 

0.6 

0.4 

0.2 

0 

5 

4.5 

4 

3.5 

3 

2.5 

2 

1.5 

1 

0.5 

0 

40 45 50 55 60 65 70 75 80 

SiO 2 (wt%) 

40 45 50 55 60 65 70 75 80 

SiO 2 (wt%) 

P 2O 5 (wt%) 

Na2O (wt%) 

0.5 

0.45 

0.4 

0.35 

0.3 

0.25 

0.2 

0.15 

0.1 

0.05 

0 

40 45 50 55 60 65 70 75 80 

SiO 2 (wt%) 

7 

6.5 

6 

5.5 

5 

4.5 

4 

3.5 

3 

2.5 

2 

40 45 50 55 60 65 70 75 80 

SiO 2 (wt%)

Rb ppm 

Zr ppm 

Pb ppm 

Yb ppm 

%3.5$ ! !(# 

160 

140 

120 

100 

80 

60 

40 

20 

0 

40 45 50 55 60 65 70 75 80 85 

Ba ppm 

 

 

 

 

 

 

 

2500 

2000 

1500 

1000 

500 

0 

40 45 50 55 60 65 70 75 80 85 

SiO SiO2 2 (wt%) % 


40 

35 

30 

25 

20 

15 

10 

5 

0 

40 45 50 55 60 65 70 75 80 85 


300 

250 

200 

150 

100 

50 

0 

40 45 50 55 60 65 70 75 80 85 

30.0 

25.0 

20.0 

15.0 

10.0 

5.0 


Y ppm 

Sr ppm 

La ppm 

 

 

 

 

 

 

 

1000 

900 

800 

700 

600 

500 

400 

300 

200 

100 

0 

40 45 50 55 60 65 70 75 80 85 

SiOSiO2 2 (wt%) % 

 

 

 

 

 

 

 

 

60 

50 

40 

30 

20 

10 

0 

40 45 50 55 60 65 70 75 80 85 

140.0 

120.0 

100.0 

80.0 

60.0 

40.0 

20.0 

SiOSiO2 2 (wt%) % 

 

 

 

 

 

 

0.0 

40 45 50 55 60 65 70 75 80 85 

SiOSiO2% 

2 (wt%) 

0.0 

40 45 50 55 60 65 70 75 80 85 

SiOSiO2% 

2 (wt%) 

 

)'

%)-$ 

! !("# 

 

Lu ppm 

30.0 

25.0 

20.0 

15.0 

10.0 

5.0 

0.0 

40 50 60 70 80 

SiOSiO2% 

2 (wt%) 

Nd ppm 

100.0 

80.0 

60.0 

40.0 

20.0 

 

 

 

 

 

 

 

 

 

 

 

 

0.0 

40 45 50 55 60 65 70 75 80 85 

SiO SiO2% 2 (wt%) 

La/Yb 

30 

25 

20 

15 

10 

5 

0 

40 50 60 70 80 


La/Lu 

30 

25 

20 

15 

10 

5 

Eu/Eu* 

0 

40 50 60 70 80 

3.0 

2.5 

2.0 

1.5 

1.0 

0.5 

SiOSiO2% 

2 (wt%) 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.0 

40 50 60 70 80 


,

%Nakamura, 1974$ "REE!$ 

 

rock/chondrite 

100 

10 

REE- Elat granite 

AD-E-17 AD-E-18 

ET16 

ET20 

AW-Sh-1 AW-Sh-1 a 

AW-Sh-1 b AW-Sh-4 

AW-Sh-6 AW-AL- 9 

AW-Sh-10 AW-Sh-11 

AW-Sh-12 AW-Sh-13 

AW-Sh-15 AW-R-16 

AW-R-17 AW-E-25 

AW-E-26 AW-E-27 

AW-E-28 

 

1 

La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 

100 

REE - mafic xenoliths 

AD-S-2 

AD-S-4 

AD-S-7 

AD-N-10 

AD-N-15 

AW-R-19 x 

AW-R-20 x 

AW-R-23 x 

AD-S-3 

AD-S-5 

AD-S-8 

AD-N-11 

AW-R-18 x 

AW-R-20 a 

AW-R-21 x 

AW-R-24 x 


10 

 

1 


100 

REE - quartz diorite and granite country rocks 

AD-S-1 

AD-S-5-H 

AD-S-6 

AW-R-18 h 

AW-R-22 h 


10 

 

1 


,

Sun 

& 

McDonough, 

$ " 

(% 

1995 

1000.0 

trace elements - Elat granite 

AD-E-17 

ET-16 

AW-Sh-1 

AW-Sh-1 b 

AW-Sh-6 

AD-E-18 

ET-20 

AW-Sh-1 a 

AW-Sh-4 

AW-AL-9 

100.0 

AW-Sh-10 

AW-Sh-12 

AW-Sh-15 

AW-R-17 

AW-E-26 

AW-E-28 

AW-Sh-11 

AW-Sh-13 

AW-R-16 

AW-E-25 

AW-E-27 

10.0 

1.0 

0.1 

Rb Ba Th U Nb La Ce Pb Pr Sr Nd Sm Zr Eu Gd Tb Y Dy Ho Er Tm Yb Lu 

1000.0 

100.0 

trace elements - mafic xenoliths 

AD-S-2 

AD-S-4 

AD-S-7 

AD-N-10 

AD-N-15 

AW-R-19 x 

AW-R-20 x 

AW-R-22 x 

AW-R-24 x 

AD-S-3 

AD-S-5 

AD-S-8 

AD-N-11 

AW-R-18 x 

AW-R-20 a 

AW-R-21 x 

AW-R-23 x 

10.0 

1.0 

 

0.1 


1000.0 

trace elements - country rocks 

AD-S-1 

AD-S-5-h 

AD-S-6 

AW-R-18 h 

AW-R-22 h 

100.0 

10.0 

1.0 

 

0.1 


,

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# ! ! ) 

2& # ) # # 

 

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87 Sr/ 86 Sr # 

87 Rb/ 86 Sr ! 87 Rb/ 86 Sr 

 

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! 1),)5 

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87 Sr/ 86 Sr 

 

#& # Rb-Sr! .& 

 

0.716 

0.714 

0.712 

87Sr/86Sr 

0.710 

0.708 

0.706 

0.704 

country rock 

Elat granite 

mafic xenolith 

1 

 

0.702 

0.0 0.2 0.4 0.6 0.8 1.0 1.2 

87Rb/86Sr 

,)

Rb-Sr! 

( 

Rb Sr 

87 Rb/ 86 Sr error 

87 Sr/ 86 Sr error 

ppm ppm 2' 2' 

AD-E-18 

AW-E 27 

AW-E-28 

# 80 300 0.752 0.060 0.709987 0.000018 

# 86 432 0.562 0.045 0.708400 0.000020 

# 95 405 0.658 0.053 0.709424 0.000028 

AW-SH-1 91 310 0.828 0.066 0.710443 0.000020 

AW-SH-4 79 338 0.659 0.053 0.709197 0.000018 

AW-SH-10 105 265 1.118 0.089 0.713759 0.000020 

AW-R-17 95 354 0.756 0.061 0.709979 0.000022 

AW-AL-9 74 361 0.578 0.046 0.708804 0.000014 

AW-R-18H 30 756 0.112 0.009 0.704203 0.000026 

AW-R-22x 25 905 0.078 0.006 0.704310 0.000011 

AW-R-18x 33 716 0.130 0.010 0.704361 0.000018 

AW-R-19x 

21 427 0.139 0.011 0.704518 0.000020 

AW-R-20x 

 

23 516 0.126 0.010 0.704178 0.000026 

AW-R-20a 

18 628 0.081 0.006 0.704103 0.000015 

AW-R-21x 

10 573 0.049 0.004 0.703881 0.000020 

AW-R-22H 

31 800 0.109 0.009 0.704103 0.000024 

AW-R-23x 

 

30 778 0.109 0.009 0.704298 0.000030 

AW-R-24x 

10 734 0.038 0.003 0.703907 0.000015 

AD-S-1 71 176 1.138 0.091 0.713174 0.000018 

AD-S-5-H 46 427 0.304 0.024 0.706167 0.000020 

AD-S-6 

70 293 0.673 0.054 0.709680 0.000016 

AD-S-2 

38 215 0.498 0.040 0.707303 0.000050 

AD-S-3 

42 274 0.432 0.035 0.707236 0.000030 

AD-S-4 

43 339 0.357 0.029 0.706275 0.000018 

AD-S-5 

 

58 393 0.416 0.033 0.706929 0.000020 

AD-S-7 

38 629 0.170 0.014 0.705229 0.000014 

AD-N-10 

20 572 0.099 0.008 0.704264 0.000014 

AD-N-14 20 342 0.165 0.013 0.704905 0.000017 

AD-N-11 

 

8 927 0.024 0.002 0.703628 0.000014 

AD-N-15 

28 409 0.193 0.015 0.705698 0.000015 

 

 

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111

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113

ocks of the calc-alkaline phase. Very low 87 Rb/ 86 Sr ratios in a few samples 

constrained the initial 87 Sr/ 86 Sr ratio of the rocks to 

. 

The results are best explained by a model where calc-alkaline felsic as well as mafic 

magmas, formed as a product of a series of partial melting events of a mafic source, 

probably due to heating by underplating basaltic melts at the base of the crust. Partial 

melting of such a source with a composition similar to that of the mafic xenoliths: 50- 

60% plagioclase, 40% amphibole, less than 5% biotie and 0.7% apatite (calculated 

based on the P 2 O 5 content of the rock samples) can produce felsic compositions with 

the REE patterns shown by the Elat granites. Therefore, I assume that the composition 

of the source rock was similar to that of the mafic xenoliths, and that they are in fact 

pieces of the source that were brought up by the magmas. 

Variation in the water content of the source at the time of melting can lead to 

production of a range of magma and restite composition. The more felsic rocks were 

produced by melting of a wet source, while less water led to production of the more 

mafic magmas. The water can originate from the breakdown of hydrated minerals or 

from the underplating basaltic melts that brought not only the heat that caused the 

melting, but also the water. 

Melting of an amphibolitic source, with many trace elements behaving as compatible 

to amphibole, can explain the flat REE patterns and the absence of Eu anomaly, and 

allows the melting products to keep the primitive trace element concentrations 

characterizing the source rock. Initial 87 Sr/ 86 Sr ratio of the calc-alkaline rocks 

resembles the initial values of mantle-derived magmas and points at an enriched 

source. Thus, it is possible that the magmas that crystallized to give the amphibolitic 

source rock were derived from an enriched mantle reservoir that was partially melted 

during a former stage of the Arabian-Nubian Shield.

ABSTRACT 

Calk-alkaline felsic magmas emplaced in the crust in the Late Proterozoic at the end 

of the island-arc stage of the Arabian-Nubian Shield, formed widespread batholiths, 

mainly in the northern part of the shield. Rocks that crystallized from these magmas 

cover over 50% of the exposed shield in Sinai, and are exposed in southern Israel in 

the area of Timna, Elat Massif and Roded Massif. Although well exposed, the 

petrogenesis of these rocks is not well known. 

In this study I investigated the petrogenesis of the Elat granite rocks exposed in the 

Elat Massif, the Roded quartz diorite and quartz monzodiorite rocks exposed in the 

Roded Massif and the mafic xenoliths within them. I examined the possibility of a 

genetic link between the Elat granites, the intermediate rocks and the mafic xenoliths, 

a linkage which can point to a common source or to similar petrogenetic processes. 

Petrographic examination of rocks collected in the field found highly alkalic feldspars 

in the granites (An- in the granites compared with An- in the quartz diorites and 

the xenoliths), and absence of calcic cores in plagioclase crystals of both granite and 

quartz diorite. A mineralogical resemblance between the mafic xenoliths and the 

intermediate country rocks was also noted. Major element analysis showed linear 

variation in oxide concentrations as silica content increases for most of the oxides, 

and a fast enrichment in K 2 O in the granitic rocks. Trace element analysis revealed 

flat patterns of REE with a very moderate increase towards the incompatible elements 

for all rocks. Heavy-REE concentrations in the more mafic samples are higher than 

those of the felsic ones. Eu anomalies are weak or absent. 

All the isotopic analyses fall on a single Rb-Sr isochron yielding an age of 

 

Ma. This age is in agreement with former radiogenic age determinations on other

The Petrogenesis of the Elat Calc-Alkaline Granite 

Ayelet Weissman 

This work was submitted as a thesis for the degree of Master of Science to the Department 

of Geology, Institute of Earth Sciences, Faculty of Mathematics and Natural Sciences, 

The Hebrew University, Jerusalem. 

The study was carried out under the supervision of: 

Prof. Oded Navon, The Hebrew University, Jerusalem 

Dr. Mordechai Stein, The Geological Survey of Israel, Jerusalem 

Dr. Ronit Kessel, The Hebrew University, Jerusalem 

Report GSI/16/2010 Jerusalem, June 2010

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