High-resolution sequence divisions and stratigraphic models of the Amu Darya right bank

Autor: Zhuang Ruan, Chuanjie Cheng, Tongcui Guo, Hongjun Wang, Liangjie Zhang, Chongyang Wu, Muwei Cheng, Bingsong Yu
Rok vydání: 2019
Předmět:
Zdroj: Arabian Journal of Geosciences. 12
ISSN: 1866-7538
1866-7511
DOI: 10.1007/s12517-019-4416-y
Popis: The Amu Darya Basin in Turkmenistan is a large petroliferous sedimentary basin. We analyzed the Callovian-Oxfordian succession of the Amu Darya right bank area based on Vail’s classic sequence stratigraphy and drill core, logging, seismic, thin-section petrographic, and geochemical data. We found that the Callovian-Oxfordian sequence can be divided into five third-order sequences (SQ1–SQ5) and 15 fourth-order sequences (sq1–sq15). A stratigraphic framework for the study area was newly established, based on these high-resolution sequence divisions. Two types of carbonate platform models were developed: (i) Callovian, in which the region was likely a ramp platform with a gradual slope to the east. It is mainly developedouter ramp and mid-ramp facies deposition which consists of micritic limestones, shoal grainstones, and reef limestones; (ii) Oxfordian, during which the region likely evolved into a rimmed platform with highly disparate sedimentation rates (low in the east) that were sensitive to sea level change, and a starkly different sedimentary landform that was high in the west and low in the east.
Databáze: OpenAIRE
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