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DOI | 10.1111/bre.12521 |
Sedimentology and provenance of newly identified Upper Cretaceous trench basin strata, Denggar, southern Tibet: Implications for development of the Eurasian margin prior to India-Asia collision | |
Orme, Devon A.; Laskowski, Andrew K.; Zilinsky, Misia F.; Chao, Wang; Guo, Xudong; Cai, Fulong; Lin, Ding | |
通讯作者 | Orme, DA (通讯作者) |
发表日期 | 2021 |
ISSN | 0950-091X |
EISSN | 1365-2117 |
起始页码 | 1454 |
结束页码 | 1473 |
卷号 | 33期号:2 |
英文摘要 | Trench basins preserved along the southern margin of the Lhasa Terrane, Tibet, are sedimentologic records of convergent margin processes preceding Cenozoic India-Asia collision. We present new sedimentologic, petrographic and geochronologic data from the Rongmawa Formation and surrounding strata near Denggar, Tibet, to determine depositional environment, provenance and age. Depositional ages range from ca. 92 to 87 Ma and lithofacies are consistent with deposition by low- and high-density turbidity currents and suspension settling of pelagic detritus in a deep-marine, trench basin setting. Sandstone modal analyses and U-Pb geochronology indicate that trench basin detritus in this region was derived from the Lhasa Terrane. We interpret that the Cretaceous subduction trench received detritus from an axial sediment dispersal system that transported sediment from headwaters in the central-southern Lhasa terrane near Lhasa City directly to the trench and then flowed westwards parallel to the trench. The preservation of trench basin strata deposited during Late Cretaceous time compared with the lack of trench deposits prior to ca. 92 Ma and after ca. 80 Ma suggests the margin experienced a period of significant accretion during this interval. In addition, deposition of trench basin strata occurred during Late Cretaceous adakitic magmatism and high-temperature metamorphism, which are hypothesized to be explained by subduction of an oceanic ridge or subduction zone retreat and related upper plate extension along the southern margin of the Lhasa terrane. Subduction of an oceanic ridge may provide a mechanism to potentially erode forearc basin strata and promote increased sediment delivery directly to the trench. |
关键词 | YARLUNG-ZANGBO SUTUREXIGAZE FORE-ARCZIRCON U-PBSUBDUCTION-ACCRETION PROCESSESTECTONIC EVOLUTIONTSANGPO SUTURENEOTETHYAN SUBDUCTIONLHASA-QIANGTANGVOLCANIC-ROCKSOPHIOLITIC MELANGE |
语种 | 英语 |
WOS研究方向 | Geology |
WOS类目 | Geosciences, Multidisciplinary |
WOS记录号 | WOS:000578098400001 |
来源期刊 | BASIN RESEARCH |
来源机构 | 中国科学院青藏高原研究所 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/260167 |
推荐引用方式 GB/T 7714 | Orme, Devon A.,Laskowski, Andrew K.,Zilinsky, Misia F.,et al. Sedimentology and provenance of newly identified Upper Cretaceous trench basin strata, Denggar, southern Tibet: Implications for development of the Eurasian margin prior to India-Asia collision[J]. 中国科学院青藏高原研究所,2021,33(2). |
APA | Orme, Devon A..,Laskowski, Andrew K..,Zilinsky, Misia F..,Chao, Wang.,Guo, Xudong.,...&Lin, Ding.(2021).Sedimentology and provenance of newly identified Upper Cretaceous trench basin strata, Denggar, southern Tibet: Implications for development of the Eurasian margin prior to India-Asia collision.BASIN RESEARCH,33(2). |
MLA | Orme, Devon A.,et al."Sedimentology and provenance of newly identified Upper Cretaceous trench basin strata, Denggar, southern Tibet: Implications for development of the Eurasian margin prior to India-Asia collision".BASIN RESEARCH 33.2(2021). |
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