Petrography, geochemistry and detrital zircon geochronology of the Srisailam Quartzite Formation, Cuddapah Basin, India: Implications for depositional age, correlation and provenance
Petrography, geochemistry and detrital zircon geochronology of the Srisailam Quartzite Formation, Cuddapah Basin, India: Implications for depositional age, correlation and provenance
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DOI：
10.1016/j.precamres.2023.106978
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发表时间：
2023-04
影响因子：
3.8
通讯作者：
S. Mukherjee;Paramita Das;G. Ghosh;Sankar Bose;J. Amal Dev;K. Das;J. K. Tomson
中科院分区：
文献类型：
--
作者：
S. Mukherjee;Paramita Das;G. Ghosh;Sankar Bose;J. Amal Dev;K. Das;J. K. Tomson
中元古代Cuddapah盆地由Papaghni组、Chitravati组、Srisailam组和Kurnool组四个不整合层序组成。从基底Papaghni群和Chitravati群以及逆冲Nallamalai群中可以获得相当数量的地质年代学和地球化学数据。然而，由于有限的地质年代学和地球化学限制，Srisailam组在沉积物沉积时间、沉积物来源位置和构造背景方面仍然是一个猜测的主题。在这项工作中，我们从Srisailam组样品中获得了新的年代学和地球化学数据（锆石U-Pb）。新资料表明，Srisailam组在时间上与基特拉瓦蒂群相关，与异域的Nallamalai群有很大不同。Srisailam组沉积物中含有少量但数量可观的古中太古代碎屑锆石，并带有海代锆石痕迹。根据碎屑锆石资料，我们认为斯里赛拉姆次盆地的沉积形成于晚侏罗世。1840 Ma，一直持续到≤ca。1770 Ma，沉积物主要来源于新太古代至古元古代，包括达尔瓦尔克拉通，沉积起源于裂谷盆地，随后演化为被动边缘环境。
The Mesoproterozoic Cuddapah Basin consists of four unconformity-bound sequences, i.e., Papaghni Group, Chitravati Group, Srisailam Formation and Kurnool Group. A fair amount of geochronological and geochemical data is available from the basal Papaghni Group and Chitravati Group as well as the overthrusted Nallamalai Group. Due to limited geochronological and geochemical constraints, the Srisailam Formation, however, remains a subject of speculation regarding the time of sediment deposition, sediment source locations, and tectonic setting. In this work, we present new geochronological and geochemical data (zircon U-Pb) from samples of the Srisailam Formation. The new data suggest that the Srisailam Formation correlates temporally with the basal Chitravati Group and is largely disparate from the allochthonous Nallamalai Group. The sediments of the Srisailam Formation contain a minor yet significant number of Palaeo-Mesoarchaean detrital zircon with traces of Haedean zircon. Based on our detrital zircon data, we argue that the sedimentation in the Srisailam sub-basin initiated afterca. 1840 Ma and continued till ≤ca. 1770 Ma and the sediments were mainly sourced from Neoarchaean to Paleoproterozoic terrains including the Dharwar Craton, and sedimentation was initiated in a rift basin that subsequently evolved to a passive margin setting.