Petrogenesis of Plio-Pleistocene volcanic rocks from the chagai arc ...

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OOFig. 3. Geological map of Koh-e-Sultan area (modified after Jones, 1960; Siddiqui, 2004).EXPLANATIONSRecent andSubrecentBoulder, gravel, alluviumand sand dunesSubrecent Terrace gravelLateKoh-e-Sultan Volcanic Group:Pleistocene Mainly dacitic lava flowsand volcaniclasticsPliocene toKoh-e-Sultan Volcanic Group:Pleistocene Andesitic to dacitic lava flowsand volcaniclasticsOligocene ?Chagai Intrusions:Adamellite and granodioritePaleoceneJuzzak Formation:Shale, sandstone, siltstoneand limestoneLate CretaceousSinjrani Volcanic Group:Basaltic to andesitic lavaflows and volcaniclastics5Dip and strikeAnticlineVolcanic calderaVolcanic domeMountain peaksVolcanogenic ironVolcanogenic sulfurO29155O6230A6245 6300N55Kansuri Koh5305Abu Koh5Dam Koh KOH-E-SULTAN Miri KohBage Koh 55105105Batal Koh10555Koh-e-Malik555B15A B2400 m1200 mSea level??0 10 20km40406
ABCDEFGHFig. 4. (A) a view of the northern part of the Miri crater of the Koh-e-Sultan volcano, (B) andesitic lavaflows intercalated with volcaniclastic rocks on the southern flank of the same volcano, (C)photomicrograph (KS-4) displaying large prismatic and polygonal phenocrysts and fragments ofhornblende within a cryptocrystalline to glassy groundmass. (D) photomicrograph (KS-21)exhibiting cumulophyric texture developed by the clustering of the hypersthene phenocrysts, (E)photomicrograph (KS-5) displaying cumulophyric texture formed by clustering of lamprobolitephenocrysts in a microcrystalline to glassy groundmass (in plane polarized light), (F) the samephotomicrograph in crossed polarized light. (G) photomicrograph (KS-20) displaying phenocrystof hornblende with well developed 124°-56° cleavage and small anhedral inclusions of quartz (incentre). Note strong zoning in some plagioclase crystals. Hornblede in top right containsmagnetite inclusions, (H) photomicrograph of dacite (KS-9) exhibiting twining and oscillatoryzoning in a phenocryst of plagioclase.7
Page 3 and 4: M APCHAGAI ARCFig. 1. Geological ma
Page 5: The Plio-Pleistocene volcanic rocks
Page 10 and 11: Table 1. Bulk chemistry of Plio-Ple
Page 12 and 13: Table 1. ContinuedElements Dam Koh
Page 14 and 15: The SiO 2 contents in KSV have a wi
Page 16 and 17: 6040R bB aKoh-e-Sultan volcanicsBat
Page 18 and 19: 500100Koh-e-Sultan volcanicsBatal K
Page 20 and 21: Table 2. A comparison of average tr
Page 22 and 23: the nature of parent magma is contr
Page 24: Pearce, J.A., 1982. Trace elements

Petrogenesis of Plio-Pleistocene volcanic rocks from the chagai arc ...

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