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Sedimentological and petrochemical studies of Jurassic clastic rocks, Habo Dome Basin, Kachchh Mainland, Northwest India: Implications for depositional environment, provenance, and tectonic setting
Island Arc ( IF 1.5 ) Pub Date : 2019-06-17 , DOI: 10.1111/iar.12307
Roohi Irshad 1 , Mohammad S. Khan 1 , Abul H. M. Ahmad 1
Affiliation  

Mesozoic rocks are extensively and excellently preserved in the western Indian shield in several basins. The Kachchh Mainland Basin (KMB), comprising six small sub‐basins, is the main repository of these sediments. Habo Dome Basin, situated in the easternmost part of KMB and largest among the six basins, hosts clastics of the Chari Formation of Jurassic age. The fluctuating transgressive–regressive facies cycle, developed during the Callovian and Late Early Oxfordian in the Habo Dome Basin, was mainly controlled by local tectonics and not by global eustatic fluctuations. Near magmatic relationships are displayed by various elements of the clastic rocks of Habo Dome Basin. Two litho‐chemical groups have been identified in Habo Dome Basin, which are cyclically repeated over entire lithostratigraphic sequence, indicating alternate pulses of sediment inputs from two different sources under palpitating tectonic conditions. Provenance indicator elements and their ratios coupled with source modeling indicate predominantly felsic source with basic and alkalic components. Integrated analysis of petrograhic and geochemical characteristics suggests two source terranes for these rocks: a granitoid source with significant basic volcanics (Banded Gneissic Complex) and a granite–gneissic source with minor alkaline volcanics (Nagarparkar Massif) lying to northeast and NNW respectively. The petrochemistry of Habo Dome clastics suggests their deposition in a fault controlled sink which was influenced by sea level changes. Drifting of the Indian plate resulted in the opening of series of rifted basins in the Kachchh Mainland during Late Triassic/Early Jurassic, which were closed later during collision of Indian plate with Eurasia at early Eocene. The Habo Dome Basin which opened up as a half graben in response to the initial stress regime, remained tectonically unstable until the cessation of pre and post collisional stress regimes.

中文翻译:

印度西北卡赫大陆哈布巨石盆地侏罗纪碎屑岩的沉积学和岩石化学研究:对沉积环境,物源和构造环境的影响

中生代岩石在几个盆地中被广泛地保存在印度西部盾构中。由六个小盆地组成的卡奇赫大陆盆地(KMB)是这些沉积物的主要储藏库。哈伯巨蛋盆地位于九巴最东端,是六个盆地中最大的盆地,拥有侏罗纪Chari组的碎屑岩。在哈博巨蛋盆地的卡洛夫期和牛津晚期晚期形成的海侵-海退相变周期主要由局部构造控制,而不是由全球向东波动控制。哈博巨蛋盆地碎屑岩的各种元素显示了近岩浆关系。在哈伯巨蛋盆地中已经确定了两个岩石化学组,它们在整个岩性地层层序中循环重复,表明在心pit构造条件下来自两个不同来源的沉积物输入的交替脉冲。种源指示剂元素及其比率与来源模型相结合,主要显示出具有碱性和碱性成分的长英质来源。岩石和地球化学特征的综合分析表明,这些岩石有两种烃源地层:分别是位于东北部和西北偏北的具有重要基础火山岩的花岗岩类烃源(带状片麻岩复合体)和具有少量碱性火山岩的花岗岩-片麻岩源(Nagarparkar Massif)。Habo Dome碎屑岩的岩石化学表明它们沉积在受海平面变化影响的受断层控制的水槽中。印度板块的漂移导致了晚三叠世/早侏罗世时期在卡奇大陆的一系列裂陷盆地的开启,在始新世早期,印度板块与欧亚大陆相撞后关闭。哈博穹顶盆地在响应初始应力状态时开裂了一半,但在构造上一直不稳定,直到碰撞前后的应力状态停止为止。
更新日期:2019-06-17
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