Facies associations and chemostratigraphy of the Lower Cretaceous Kurnub Group and their boundaries, King Talal Dam section, northwestern Jordan

Q2 Earth and Planetary Sciences

Environmental Geosciences Pub Date : 2018-03-01 DOI:10.1306/EG.01241817012

S. Farouk, H. Al-Zubi, T. Abdelkader, F. Ahmad

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引用次数: 3

Abstract

Integrated petrographic and chemostratigraphic studies have enabled the identification of sequence boundaries, sequence stratigraphy, and their system tracts for the Lower Cretaceous strata of the Kurnub Group (Jordan); the latter is underlain by the Jurassic (Callovian) strata and overlain by the Cretaceous (Cenomanian). Based on physical characteristics (sharp vertical facies changes) and geochemical parameters (SiO2/Al2O3, K2O/Al2O3, TiO2/Al2O3, Sr/Ca millimoles per mole, Mn parts per million, and the minor elements), 4 sequence boundaries are identified, associated with 11 facies types (from alluvial plain to the intertidal environment) and 9 system tracts, thus enabling the identification of record Lower Cretaceous sea-level fluctuations. The identified sequences mirror the Arabian plate sequences and suggest a eustatic origin. The siliciclastic Kurnub Group was derived mainly from felsic granite–gneiss and metasedimentary rocks (Arabian shield) and was deposited in a passive continental margin setting under semiarid-to-humid climatic conditions.

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约旦西北部King Talal坝段下白垩统Kurnub群及其边界相组合、化学地层学研究

通过综合岩石学和化学地层学研究，能够确定Kurnub群（约旦）下白垩纪地层的层序边界、层序地层学及其系统域；后者下伏侏罗系（卡洛维阶）地层，上伏白垩纪（Cenomanian阶）。根据物理特征（急剧的垂直相变化）和地球化学参数（SiO2/Al2O3、K2O/Al2O3、TiO2/Al2O3、Sr/Ca毫摩尔/摩尔、Mn百万分之一和微量元素），确定了4个层序边界，涉及11种相类型（从冲积平原到潮间带环境）和9个系统域，从而能够识别有记录的下白垩纪海平面波动。已确定的序列反映了阿拉伯板块序列，并表明其为海平面成因。硅化碎屑Kurnub群主要来源于长英质花岗岩-片麻岩和变质沉积岩（阿拉伯地盾），沉积在半干旱至潮湿气候条件下的被动大陆边缘。

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Environmental Geosciences Earth and Planetary Sciences-Earth and Planetary Sciences (all)

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