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

M APCHAGAI ARCFig. 1. Geological map of the Chagai-Raskoh arc terrane, Balochistan, Pakistan (modified and reproduced after Bakr and Jackson, 1964;Siddiqui et al., 2005).E X P L A N A T I O N SRecent &SubrecentUnconsolidated gravel,sand & alluviumPlio-PleistoceneKoh-i-Sultan volcanic GroupMiocene-PlioceneMioceneOligocene-MioceneOligoceneMid. Eoceneto OligoceneEoceneEr. EocenePaleoceneLt.Cretaceousto PaleoceneD = Dalbandin and K = KhojakFormationsBuze Mashi Koh /Saindak Koh volcanicsChagai Intrusions(third phase)Amalaf Formation. The pyroclastics are marked asSain da k Form at io n. T h e l av a flo w s &th e T an k i S i l ls a re m a rk e d a s a n drespectively (second phase of Chagai Intrusions)Kharan LimestoneJuzzak / Rakhshani Formation. The lava flowsare marked asRaskoh intrusions & first phaseof Chagai IntrusionsCretaceous Sinjrani Volcanic GroupCretaceousNauroze FormationKuchakki Volcanic GroupBunap sedimentary complexCharkohan radiolarian chertRaskoh Ophiolitic MelangeVRaskoh AccretionaryComplexLt. JurassicEr. to Md. JurassicEr. Jurassic ?D K(not shown on the map)Mesozoic-CenozoicContinental shelf sediments of Indian plateM a j o r T h r u s t sMinor Thrusts O t h e rF a u l t sNZS I N O - K O R EAY A N G T Z EAFGHANISTANPAKISTANIRANPAKISTANINDIAN PLATENushkiK Kohistan arcC Chagai arcZ Zagros arcCF Chaman FaultHRF Harirud FaultMAP Makran Accretionary PrismZTURANH RFIRAN AFGHANC FPAMIR SERINDAKTARIMEURASIACPAKISTANA F R I C A NPLATEA R A B I A N P L A T E0I N D I A N P L A T E1000kmINDIAM SZIND O-SIN A61 o 62 o 63 o 64 o 65 oBatal Koh VolcanicsSample Nos. Bk-1 to Bk-7Dam Koh VolcanicsSample Nos. Dk-1 to Dk-5RobatKoh-e-Dalil VolcanicsSample Nos. Kd-1 to Kd-4KachaMaki ChahVSaindak AmalafKoh-e-SultanVolcanicsSample Nos. Ks-2 to Ks-12BChagaiAhmad Wal29 oFig. 2PadagNok ChahJuzzakNok KundiDalbandinRASKOH ARCYakmachKharan28 o 63 o 64 o0 150km3