| Provenance, Tectonic Setting and Geochemistry of Ahwaz Sandstone Member (Asmari Formation, Oligo-Miocene), Marun Oilfield, Zagros Basin, SW Iran |
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| 作者姓名： | Shahram AVARJANI Asadollah MAHBOUBI Reza MOUSSAVI-HARAMI and Hassan AMIRI-BAKHTIAR |
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| 作者单位： | 1 Department of Geology, Faculty of Science, Ferdowsi University of Mashhad, Iran
2 Department of Geology, National Iranian south Oil Company, Iran |
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| 基金项目： | We thank the National Iranian Oil Company for providing core samples and thin sections, and the Ferdowsi University of Mashhad for their logistic support during this study. |
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| 摘 要： | The Asmari Formation deposited in the Zagros foreland basin during the OligoceneMiocene. Lithologically, the Asmari Formation consists of limestone, dolomitic limestone, dolomite, argillaceous limestone, some anhydrite(Kalhur Member) and sandstones(Ahwaz Member). This study is based on the analysis of core samples from four subsurface sections(wells Mn-68, Mn-281, Mn-292 and Mn-312) in the Marun Oilfield in the Dezful embayment subzone in order to infer their provenance and tectonic setting of the Ahwaz Sandstone Member. Petrographical data reveal that the Ahwaz Sandstone comprises 97.5% quartz, 1.6% feldspar, and 0.9% rock fragments and all samples are classified as quartz arenites. The provenance and tectonic setting of the Ahwaz Sandstone have been assessed using integrated petrographic and geochemical studies. Petrographic analysis reveals that mono- and poly-crystalline quartz grains from metamorphic and igneous rocks of a craton interior setting were the dominant sources. Chemically, major and trace element concentrations in the rocks of the Ahwaz Sandstone indicate deposition in a passive continental margin setting. As indicated by the CIW′ index(chemical index of weathering) of the Ahwaz Sandstone(average value of 82) their source area underwent "intense" recycling but "moderate to high" degree of chemical weathering. The petrography and geochemistry results are consistent with a tropical, humid climate and low-relief highlands.
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| 关 键 词： | 地球化学 构造背景 前陆盆地 砂岩段 中新世 化学风化程度 种源 油田 |
| 收稿时间： | 2013/5/26 0:00:00 |
| 修稿时间： | 2013/11/6 0:00:00 |
Provenance,Tectonic Setting and Geochemistry of Ahwaz Sandstone Member （Asmari Formation,Oligo-Miocene）, Marun Oilfield,Zagros Basin,SW Iran |
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| Authors: | 《Acta Geologica Sinica》 |
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| Abstract: | The Asmari Formation deposited in the Zagros foreland basin during the Oligocene‐Miocene. Lithologically, the Asmari Formation consists of limestone, dolomitic limestone, dolomite, argillaceous limestone, some anhydrite (Kalhur Member) and sandstones (Ahwaz Member). This study is based on the analysis of core samples from four subsurface sections (wells Mn‐68, Mn‐281, Mn‐292 and Mn‐312) in the Marun Oilfield in the Dezful embayment subzone in order to infer their provenance and tectonic setting of the Ahwaz Sandstone Member. Petrographical data reveal that the Ahwaz Sandstone comprises 97.5% quartz, 1.6% feldspar, and 0.9% rock fragments and all samples are classified as quartz arenites. The provenance and tectonic setting of the Ahwaz Sandstone have been assessed using integrated petrographic and geochemical studies. Petrographic analysis reveals that mono‐ and poly‐crystalline quartz grains from metamorphic and igneous rocks of a craton interior setting were the dominant sources. Chemically, major and trace element concentrations in the rocks of the Ahwaz Sandstone indicate deposition in a passive continental margin setting. As indicated by the CIW' index (chemical index of weathering) of the Ahwaz Sandstone (average value of 82) their source area underwent “intense” recycling but “moderate to high” degree of chemical weathering. The petrography and geochemistry results are consistent with a tropical, humid climate and low‐relief highlands. |
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| Keywords: | Asmari Formation Dezful Embayment provenance tectonic setting sandstone geochemistry Ahwaz Sandstone Member |
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