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首页> 外文期刊>Asian journal of earth sciences >Depositional Environment Interpretation of Lar Formation(Upper Jurassic) Based on Study of Clay Mineralogy and Microfacies in East Azarbaijan (North Western of Iran)
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Depositional Environment Interpretation of Lar Formation(Upper Jurassic) Based on Study of Clay Mineralogy and Microfacies in East Azarbaijan (North Western of Iran)

机译：基于东阿扎拜疆（伊朗西北部）粘土矿物学和微相研究，对侏罗系上部侏罗系沉积环境解释

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摘要

Microscopic and field studies on the Lar formation in south west of Azarshahr in Haft-Cheshme anticline section is due to separate of three part of marl, marly carbonate and carbonate in this formation. According to microfacies and macroscopic fossils in carbonate section, open marine environment were identified from a carbonate ramp. XRD test samples related to clay marl in the low and middle part indicated existence of clay mineral such as illite and cholorite from clastic origin in the part of upper and middle marl and illite and smectite are diagenetic origin in the lower marl. The simultaneous presence of the minerals in the middle marl and the lack of smectite in this section represent of temperate climate conditions are during deposition of the middle marl. The semi-quantitative analysis of the XRD is indicating of smectitec increasing and illite decreasing in the lower marl part which it may represent of a warming climate and depth sea relative increase and it was consistent with sea level change global. Important digenetic process of identified in these formations are include: Cementation, primary and secondary porosity and chert nodules formations (constituents) which the secondary porosity is more than a fracture and channel types. The existence of these fractures has created suitable underground water aquifers in this area.
机译：在Haft-Cheshme背斜剖面上的Azarshahr西南部Lar地层的微观和野外研究是由于该地层中的泥灰岩，碳酸盐岩和碳酸盐岩三部分分开。根据碳酸盐岩剖面的微相和宏观化石，从碳酸盐岩坡道中识别出开放的海洋环境。与中，下部泥灰岩有关的XRD测试样品表明，上，中部泥岩部分存在碎屑状伊利石，绿泥石等粘土矿物，下泥灰岩为伊利石和绿土。中部泥灰岩中矿物质的同时存在以及该地区缺少蒙脱石代表了温带气候条件，这是在中部泥灰岩沉积期间。 X射线衍射的半定量分析表明，下泥灰岩中蒙皂石的增加和伊利石的减少，这可能表示气候变暖和深海的相对增加，并且与全球海平面变化是一致的。在这些地层中识别出的重要的成岩过程包括：胶结作用，主要和次生孔隙度以及石结核形成（成分），次生孔隙度大于裂缝和通道类型。这些裂缝的存在在该地区创造了合适的地下水含水层。

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