孟加拉湾若开盆地北部陆架的碎屑锆石出露记录

IF 3.7 2区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Liangbo Ding , Hongxia Ma , Guozhang Fan , Xiaoyong Xu , Hongping Wang , Guoping Zuo , Ying Zhang , Hui Sun , Jianan Wu , Junmin Jia , Ming Su , Ce Wang
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引用次数: 0

摘要

若开盆地的新生代地层在油气勘探中起着至关重要的作用;然而,对这些沉积岩的成因调查仍然很少。在本研究中,我们在若开邦大陆架北部采用了锆英石地质年代学和地球化学方法来研究沉积岩的成因,并结合之前的研究,确定了沉积岩的时空变化,阐明了中新世中期以来的成因演变。锆石地球化学结果表明,沉积岩的主要来源岩石是岩浆岩和变质岩,尤其是大陆弧和碰撞后花岗岩。这些岩石的成因可归结为北部的冈底斯弧岩浆带和东部的印缅山脉。若开邦北部沉积岩的锆石 U-Pb 年龄峰值主要位于 0-150 Ma、400-600 Ma、600-1000 Ma 和 1600-2100 Ma,少量位于 150-400 Ma 和 2100 Ma。碎屑锆石来源研究表明,中新世沉积岩中的锆石主要来源于古梵净山河,所占比例从68.7%到77.0%不等。在上新世,古梵天河和吉大港-特里普拉褶皱带是最主要的沉积物提供者。自更新世早期以来,若开邦北部沿海地区在沉积物组成中发挥了重要作用。雅鲁藏布江是上更新世岩石的主要来源,在整个更新世,若开沿海地区对大陆架的贡献不断加强。结合区域构造演化,我们的研究强调了印度板块俯冲的重要性,它是影响孟加拉湾东北部产状转变的关键因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Detrital zircon provenance record of the northern shelf in the Rakhine Basin, Bay of Bengal
The Cenozoic strata in the Rakhine Basin play a crucial role in hydrocarbon exploration; however, the provenance of these sedimentary rocks remains poorly investigated. In this study, we employed detrital zircon geochronology and geochemistry in the northern Rakhine shelf to investigate the provenance of sedimentary rocks and, combined with the previous studies, to identify their spatial and temporal variations and to elucidate the provenance evolution since the middle Miocene. The geochemical results of the zircons indicate that the primary source rocks of the sedimentary rocks are magmatic and metasedimentary rocks, particularly those of continental arc and post-collision granites. The origin of these rocks can be attributed to the Gangdese arc magmatic belt in the north, as well as the Indo-Burma Ranges in the east. The sedimentary rocks in the northern Rakhine yield zircon U-Pb age peaks primarily at 0–150 Ma, 400–600 Ma, 600–1000 Ma, and 1600–2100 Ma, with minor populations at 150–400 Ma and >2100 Ma. The detrital zircon provenance study shows that the zircons in the Miocene sedimentary rocks were primarily derived from the paleo-Brahmaputra River, with contributions ranging from 68.7% to 77.0%. During the Pliocene, the paleo-Brahmaputra River and the Chittagong-Tripura Fold Belt were the most significant sediment suppliers. Since the early Pleistocene, the northern Rakhine coastal region has played a significant role in their composition. The Brahmaputra River was the predominant contributor to upper Pleistocene rocks, and the Rakhine coastal region's contribution to the shelf intensified throughout the Pleistocene. In conjunction with regional tectonic evolution, our study underscores the importance of the Indian Plate subduction as a pivotal factor influencing the provenance transitions in the northeastern Bay of Bengal.
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来源期刊
Marine and Petroleum Geology
Marine and Petroleum Geology 地学-地球科学综合
CiteScore
8.80
自引率
14.30%
发文量
475
审稿时长
63 days
期刊介绍: Marine and Petroleum Geology is the pre-eminent international forum for the exchange of multidisciplinary concepts, interpretations and techniques for all concerned with marine and petroleum geology in industry, government and academia. Rapid bimonthly publication allows early communications of papers or short communications to the geoscience community. Marine and Petroleum Geology is essential reading for geologists, geophysicists and explorationists in industry, government and academia working in the following areas: marine geology; basin analysis and evaluation; organic geochemistry; reserve/resource estimation; seismic stratigraphy; thermal models of basic evolution; sedimentary geology; continental margins; geophysical interpretation; structural geology/tectonics; formation evaluation techniques; well logging.
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