Detrital Zircon U-Pb Dating for Clastic Rocks from Boreholes in the Eastern Junggar Basin: Constraints on Permian Tectonics in the Southern Central Asian Orogenic Belt

IF 3.5 3区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Acta Geologica Sinica ‐ English Edition Pub Date : 2024-12-19 DOI:10.1111/1755-6724.15174

Xincheng REN, Guanlong ZHANG, Jinduo WANG, Kuihua ZHANG, Xuecai ZHANG, Ma JI, Hongzhou YU

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Abstract

Permian sedimentary successions, widely distributed in the eastern Junggar Basin, may record key details on the closure of the Paleo-Asian Ocean in this region. Results of boreholes show that Permian strata is mainly composed of mudstone, sandy mudstone, siltstone, sandstone, sandy conglomerate, dolomite, and limestone. Detrital zircon U-Pb dating results of three sandstone samples yielded the calculated maximum ages of 296 Ma, 278 Ma and 293 Ma, indicating they possibly deposited during the Early Permian. Permian strata in the eastern Junggar Basin show similar rock associations and detrital zircon age data distribution patterns. Our new and compiled age data for sandstone samples in the eastern Junggar Basin and Bogda region yield predominant Paleozoic ages, close to their sedimentary ages. Such detrital zircon age data distribution patterns support the hypothesis that these Early Permian meta-clastic rocks in the eastern Junggar Basin and Bogda region were deposited in a subduction-related basin, and indicate an Early Permian Ocean prevented Precambrian detritus from the Central Tianshan block from depositing in the eastern Junggar Basin and Bogda region.

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准噶尔盆地东部钻孔碎屑岩锆石U-Pb定年：中亚造山带南部二叠纪构造的约束

准噶尔盆地东部广泛分布的二叠系沉积序列可能记录了该地区古亚洲海洋闭合的关键细节。钻孔结果表明，二叠系地层主要由泥岩、砂质泥岩、粉砂岩、砂岩、砂质砾岩、白云岩和灰岩组成。3个砂岩样品的锆石U-Pb测年结果显示，其最大年龄分别为296 Ma、278 Ma和293 Ma，表明它们可能沉积于早二叠世。准噶尔盆地东部二叠系地层具有相似的岩石组合和碎屑锆石年龄数据分布模式。本文对准噶尔盆地东部和博格达地区砂岩样品进行了新的年龄整理，结果表明，其古生代年龄与沉积年龄接近。这些碎屑锆石年龄分布模式支持了准噶尔盆地东部和博格达地区早二叠世变质碎屑岩沉积于与俯冲有关的盆地的假设，表明早二叠世海洋阻止了中天山地块前寒武纪碎屑岩沉积于准噶尔盆地东部和博格达地区。

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来源期刊

Acta Geologica Sinica ‐ English Edition 地学-地球科学综合

CiteScore

3.00

自引率

12.10%

发文量

3039

审稿时长

6 months

期刊介绍： Acta Geologica Sinica mainly reports the latest and most important achievements in the theoretical and basic research in geological sciences, together with new technologies, in China. Papers published involve various aspects of research concerning geosciences and related disciplines, such as stratigraphy, palaeontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration.