petrology of ultramafic and related rocks along iraqi zagros thrust zone

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2-1-1-3 Red Bed Series Red Bed Series consist of molasse sediments and is subdivided into four units : 1. Suwais I consists of fossiliferous, detrital, conglomeratic limestone. The unit is massive in lower part and iterbedded with shale in upper unit. The total thickness is 50 m. 2. Suwais II consists of red ferrogeneous siliceous, and slity shale with siltstone and conglomeratic beds which contain reworked Cretaceous fossils. The total thickness is 300 m. 3. Suwais III consists of coarse, partly cobble-sized cherty conglomerate. The total thickness is 350 m. 4. Suwais IV consists of red shale and sandstone, with reddish nummulitic limestone. The Suwais I was deposited in shallow marine environment and the other three units were deposited in deltaic to fluviodelatic depositional environments. 2-1-2 Geology of Mawat - Chwarta area 2-1-2-1 Mawat Ophiolite The Mawat igneous complex represents one of ophiolitic sequence within the Iraqi Zagros Thrust Zone. It shows north-south trending longitudinal shape (Fig. 2-3), with 25 km length and 7–12 km width. The complex consists of peridotite overlaid by banded gabbro and volcanic rocks. Peridotite is composed mostly of harzburgite and dunite. Some lherzolite pods are found in the harzburgite portion. It covers an area about 15 km 2 with total thickness of 1500 m. Different types of gabbro are recognized. They are pyroxene gabbro and banded gabbro. Pyroxene gabbro is restricted to the east part of the Mawat ophiolite sequence near the village 17
of Luta-Rash. Volcanic rocks are exposed to the north and south of the Mawat ophiolite sequence, and comprise spilitic basalt and metabasalt. 2-1-2-2 Walash – Nouprdan Group Al-Mehidi (1975) subdivided the Walash-Nouprdan Group into two isolated rock units, which are Walash and Nouprdan Formations. Nouprdan Formation represents the outer zone of Mawat ophiolite sequence, with a total thickness of about 700 m. It consists of grayshale, graywake, and shaly limestone with some acidic and basic volcanic intrusions, of Plaeocene-Oligocene ages. Walash Formation consists of three red bed units intercalated by two volcanic ones, and the total thickness is 3700 m. Basal red bed unit consists of red mudstone, cherty limestone and shale, with lower volcanic unit of basic rocks, and is accompanied with a few acidic pillow lava. The middle red bed unit consists of red mudstone, shale, sandstone and conglomerate. The upper volcanic unit consists of metabasic rocks with a few andesitic lava; the upper red bed unit consists of red mudstone and clastic sediment, composed of conglomerates, siltstone and graywakes. 2-1-2-3 Betwat-Kunjren serpentinite belt Betwat-Kunjren serpentinite belt represented by a chain of isolated serpentinite bodies extends from the village of Betwat toward north of the Mawat subdistrict. Isolate serpentinites of 500 m wide and 1 km long are aligned to form an array parallel to the main Mawat ophiolite body. It resprsents typical diapiric serpentinite in forearc tectonic setting (Mohammad and Maekawa, 2007). It consists of massive type serpentinite surrounded by metavolcanic rock unit of Walash Formation. 2-1-2-4 Gimo unit 18
Page 1 and 2: PETROLOGY OF ULTRAMAFIC AND RELATED
Page 3 and 4: We certify that we read this thesis
Page 5 and 6: ABSTRACT Four main ultramafic rock
Page 7 and 8: CONTENTS Chapter 1: Background, Aim
Page 9 and 10: Chapter 7: Conclusions and Recommen
Page 11 and 12: Figure 3 - 10: Field photograph of
Page 13 and 14: albite - tremolite zone, E = albite
Page 15 and 16: Figure 6 - 19: Time-paragenesis, al
Page 17 and 18: Table 6 - 2: Representative microna
Page 19 and 20: 1 BACKGROUND 1-1 Ultramafic rocks U
Page 21 and 22: ocks of the belt. These attributes
Page 23 and 24: 1-1-3 Metamorphism of ultramafics M
Page 25 and 26: Reaction 1: Isochemical serpentiniz
Page 27 and 28: 1-2-2 Jadeitites Jadeitite is compo
Page 29 and 30: In combining the new data on the se
Page 31 and 32: 2-1 Regional geology The Iraq Zagro
Page 33: 2-1-1 Geology of Penjwin area 2-1-1
Page 37 and 38: and a sandstone unit of the Paleoce
Page 39: Fig. 2-1: Tectonic subdivision of I
Page 42 and 43: Fig. 2-4: Field photograph of Gimo
Page 45 and 46: Chapter 3 Petrology of ultramafic r
Page 47 and 48: 3-1-2 Harzburgite Harzburgite is th
Page 49 and 50: 3-1-6 Serpentinite Two types of ser
Page 51 and 52: small amount of ilmenite. Hornblend
Page 53: In places, it is surrounded by fine
Page 62 and 63: 4 Mineralogy and mineral chemistry
Page 64 and 65: compositions with Mg-number ranging
Page 66 and 67: 4-3-4 Hydrous phases Hydrous phases
Page 68 and 69: Fig 4 -3: Compositions of chromian
Page 70 and 71: Fig 4 -6: Compositions of chromian
Page 72 and 73: Chapter 5 Discussions 55
Page 74 and 75: the tectonite region of the graph (
Page 76 and 77: involves loss and gain of CaO, SiO
Page 78 and 79: Fig. 5 - 1: Chromian spinel composi
Page 80 and 81: Fig. 5-3: Cr-number in spinel vs. F
Page 82 and 83: Chapter 6 Related rock 65
Page 84 and 85:
plagioclase (Figs. 6 - 2 G,H) and z
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Plagioclase and ilmenite are the or
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2 CaAl 2 Si 2 O 8 (anorthite) + Na
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apatite grains, characterized by bl
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the rim. Estimated pressure - tempe
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16 clinozoisite + H 2 O. (16) From
Page 96 and 97:
metamorphism. It was also formed du
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Fig. 6 - 2: Photomicrographs and im
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Fig. 6 - 4: Backscattered electron
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Fig. 6 - 7: Line scan profile acros
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Fig. 6 - 9: Line scan profile of pa
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Fig. 6 - 11: (A) Backscatter electr
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Fig. 6 - 13: Field of the approxima
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Fig. 6 - 15: Whole rock chemical co
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Fig. 6 - 17: Whole rock chemical co
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Fig. 6 - 19: Time-paragenesis, albi
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1 Conclusions 1. The Iraqi Zagros T
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2 Recommendations for further works
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Arai, S., 1987. An estimation of th
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Chakhmouradian, A.R., Reguir, E.P.,
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Evans, B.W., Frost, B.R., 1975. Chr
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Kamenetsky, V., Crawford, A. J., an
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Morand, V.J., 1990. High chromium a
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Watson, E.B., Wark, D. A. and Thoma
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Table 4 - 1: Representative microna
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Table 4 -11: Representative microna
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Table 4 -13: Representative microna
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Research public activity Peer-revie
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petrology of ultramafic and related rocks along iraqi zagros thrust zone

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