中亚中生代西南准噶尔盆地的源-汇分析:来自底质石榴石和电气石地球化学的证据

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Geochemistry Geophysics Geosystems Pub Date : 2024-06-29 DOI:10.1029/2024GC011455
X. Guan, C. Wu, Y. Xu, J. Saylor, C. Lin, W. Zhang
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引用次数: 0

摘要

源-汇系统响应并因此可能记录地形和构造的变化。在天山带以北,准噶尔盆地西南部的锡克苏子盆地从三叠纪的积极扩张过渡到侏罗纪-白垩纪的扩张后沉降。锡克苏子盆地的沉积物已被证明来自天山。然而,源-汇系统的细节仍不清楚,代用记录之间也存在差异。四棵树子盆地中三叠统的重矿物以石榴石为主。为了研究石榴石的来源并破解中生代从源到汇的演化过程,我们进行了岩石学和沉积学分析以及碎屑石榴石和电气石地球化学研究。我们发现,中三叠世砂岩中的石榴石地球化学与天山伊犁地块(YB)矽卡岩中的石榴石地球化学最为一致,而其他中生代砂岩中55%-84%的石榴石地球化学与YB闪长岩中的石榴石地球化学一致。自上三叠世以来,电气石的地球化学性质与YB和中天山地块的元沉积岩的地球化学性质一致。中三叠世的石榴石主要来自矽卡岩,这可能表明石榴石是近源点出露的,而上三叠世-下白垩世的石榴石成分范围更广,这表明石榴石有多个来源。我们推断点源变为多源,这与锆石光谱从单模态变为多模态是一致的。这一变化反映了伴随着从活跃断裂到后断裂阶段的排水扩展。
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Source-To-Sink Analysis in the Mesozoic SW Junggar Basin, Central Asia: Evidence From Detrital Garnet and Tourmaline Geochemistry

Source-to-sink systems respond to and therefore potentially record topographic and tectonic changes. North of the Tian Shan Belt, the Sikeshu subbasin of the SW Junggar Basin transitioned from active extension in the Triassic to post-extensional subsidence in the Jurassic-Cretaceous. Sediment in the Sikeshu subbasin has been shown to be derived from the Tianshan. However, the details of the source-to-sink system remain unclear and discrepancies exist between proxy records. The heavy minerals in the Middle Triassic in the Sikeshu subbasin are dominated by garnets. To investigate the garnet sources and decipher the Mesozoic source-to-sink evolution, we conducted petrological and sedimentary analysis and detrital garnet and tourmaline geochemistry. We found that the geochemistry of garnets in the Middle Triassic sandstone is most consistent with that of the skarns in the Yili Block (YB) in Tianshan, while the geochemistry of 55%–84% of garnets in other Mesozoic sandstones is consistent with that of garnets in amphibolites in the YB. The geochemistry of the tourmalines since the Upper Triassic is consistent with that of the meta-sedimentary rocks in the YB and Central Tianshan Block. The dominance of garnets sourced from skarns in the Middle Triassic probably indicates a near-source point provenance and the broader range of garnet compositions from the Upper Triassic–Lower Cretaceous suggests multiple sources. We infer that the point source changed to multiple sources, which is consistent with the zircon spectra changing from unimodal to multimodal. This change reflects the expansion of the drainage that accompanies a change from active rifting to a post-rift stage.

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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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