伊朗中部库姆组含硅质沉积的时代、微相及沉积环境

IF 1 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Fatemeh Morovati, M. M. Ataabadi, M. Arian, A. Zohdi, Mohsen Al-e Ali
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引用次数: 3

摘要

海牛是最近在库姆组沉积物中发现的特殊脊椎动物化石。然而,在详细的古环境和微观古生物研究方面,对含锡雷尼亚石灰岩的了解仍然很少。为了区分伊朗中部库姆组Sirenia(海牛)矿床的时间和古环境背景,研究了Hamedan省(Ivak和Shirinsu)和Isfahan省(Chahriseh)的三个地层剖面。共研究了47个薄片,用于微观古生物、生物分带和碳酸盐微相分析,以及沉积环境重建。生物地层学调查表明,Sirenia矿床的年龄为Aquitania/Burdigalian,这意味着海牛遗骸的时代限制在下中新世。我们在研究区识别出9种微相(n=8对应碳酸盐岩;n=1对应硅化碎屑岩)。它们被系统地分为两个微相环境,分别代表内斜坡环境和中斜坡环境。这是基于岩相组合以及骨骼成分和岩石纹理的分布。含Sirenia的石灰岩由球粒状/含藻类的杂砂岩/泥粒石/浮石组成。浅水条件下的碳酸盐岩(内部)斜坡系统被解释为伊朗中部Aquitanian/Burdigalian时期西里尼亚哺乳动物的栖息地。这种古环境背景可用于进一步勘探库姆组矿床,以发现海牛。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Age, microfacies and sedimentary environments of the Sirenia-bearing deposits of the Qom Formation in Central Iran
Sea cows are exceptional fossil vertebrates recently discovered in the deposits of the Qom Formation. Yet, the Sirenia-bearing limestones are still poorly understood in terms of detail paleoenvironmental and micropaleontological investigations. In order to distinguish the temporal and paleoenvironmental context of the Sirenia (sea cow) bearing deposits of the Qom Formation in central Iran, three stratigraphic sections were studied in Hamedan (Ivak and Shirinsu) and Isfahan (Chahriseh) provinces. A total number of 47 thin sections were studied for micropaleontology, biozonation and carbonate microfacies analysis, as well as sedimentary environment recounstruction. Biostratigraphical investigations suggest that the Sirenia-bearing deposits are Aquitanian/Burdigalian in age, which implies restriction of sea cows remains to the Lower Miocene. We recognized nine microfacies (n=8 correspond to carbonate; n=1 correspond to siliciclastic) in the study areas. They are systematically grouped into two microfacies settings, representing inner and middle ramp environments. This is based on the facies associations and the distribution of skeletal components and rock textures.  The Sirenia-bearing limestone consists of peloid/algae bearing wackstone/packstone/floatstone. A carbonate (inner) ramp system under shallow water conditions is interpreted as the habitats of the Sirenian mammals during the Aquitanian/Burdigalian in Central Iran. This paleoenvironmental setting could be utilized for further exploration of Qom Formation deposits for discovering sea cows.
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来源期刊
Iranian Journal of Earth Sciences
Iranian Journal of Earth Sciences GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
1.40
自引率
12.50%
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