南跨华北造山带台华杂岩含星黄岩变质片岩的P-T路径及其构造意义

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2025-03-15 DOI:10.1016/j.precamres.2025.107754

Xinyue Han , Laixi Tong , Zhao Liu , Chao Li , Mingguo Zhai , Jiali You , Feng Zhou , Kexin Wu , Xiaoping Long , Yue Gao

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引用次数: 0

摘要

台华杂岩位于华北克拉通跨华北造山带南缘，是解读华北造山带构造演化的关键区域。本文采用岩石学、相平衡模拟和LA-ICP-MS锆石U-Pb定年等方法对芦山台花杂岩中含星黄岩变质岩片岩进行了综合研究。岩石学观察表明，其变质演化过程为四阶段，包括：(1)峰前（M1）组合，由石榴石岩心及其矿物包裹体（橄榄石、斜长石、黑云母、石英、钛铁矿和金红石）组成；(2)压力峰（M2）组合以斜长石、黑云母、石英、钛铁矿和金红石包裹体为代表，硅线石后存在蓝晶石伪晶，拉曼光谱证实了这一组合；(3)以蓝晶石向硅线石转变、钛铁矿部分取代金红石为特征的减压阶段（M3）；(4)末期（M4）以黑云母+斜长石+石英±硅线石的细粒组合为标志，局部包裹着石榴石斑母岩。相平衡模拟结果表明，变质长石片岩经历了高角闪岩相变质作用，P-T条件分别接近654 ~ 661℃/8.7 ~ 9.1kbar （M1）和751 ~ 766℃/10.7 ~ 11.1 kbar (M2)，随后经历减压，轻微升温至778 ~ 795℃/7.2 ~ 7.9 kbar (M3)，最后经历冷却至699 ~ 702℃/7.1 ~ 7.2 kbar （M4）。因此，一个顺时针的P-T路径被检索。锆石U-Pb定年得到207Pb/206Pb加权平均年龄为1883±9 Ma，解释为峰后冷却时间。因此，可以推断，台华杂岩在晚古元古代参与了北陆西、东地块的碰撞。根据已有的资料，我们认为台华杂岩记录了约1.95 Ga的压力峰值变质年龄和约1.93(1.92)~ 1.80 Ga的冷却年龄。主要的地壳增厚过程可能发生在约1.95 Ga，随后是隆升，最后在约1.93(1.92)~ 1.80 Ga冷却。

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P-T path of staurolite-bearing metapelitic schist from the Taihua Complex, southern Trans-North China Orogen, and tectonic implications

The Taihua Complex, located on the southern margin of the Trans-North China Orogen (TNCO), North China Craton, is a critical region for decoding tectonic evolution of the TNCO. In this study, an integrated investigation of petrology, phase equilibrium modelling and LA-ICP-MS zircon U-Pb dating is undertaken for the staurolite-bearing metapelitic schist in the Lushan Taihua Complex. Petrographic observations reveal a four-stage metamorphic evolution, including: (1) A pre-peak (M1) assemblage consisting of the garnet core and its mineral inclusions of staurolite, plagioclase, biotite, quartz, ilmenite and rutile; (2) The pressure peak (M2) assemblage represented by the inclusions of plagioclase, biotite, quartz, ilmenite and rutile within garnet rims, and the presence of kyanite pseudomorphs after sillimanite, which is confirmed by the Raman spectra; (3) The decompression stage (M3) characterized by the transformation from kyanite to sillimanite as well as partial replacement of rutile by ilmenite; and (4) the final stage (M4) marked by the fine-grained assemblage of biotite + plagioclase + quartz ± sillimanite, locally surrounding the garnet porphyroblasts. Phase equilibrium modelling results suggest that the metapelitic schist experienced the high-amphibolite facies metamorphism, with P-T conditions approaching 654 ∼ 661℃/8.7 ∼ 9.1kbar (M1) and 751 ∼ 766 ℃/10.7 ∼ 11.1 kbar (M2), followed by a decompression with minor heating to 778 ∼ 795 ℃/7.2 ∼ 7.9 kbar (M3), and finally, the rocks underwent a cooling process until 699 ∼ 702 ℃/7.1 ∼ 7.2 kbar (M4). Thus, a clockwise P-T path is retrieved. Zircon U-Pb dating yields a weighted mean ²⁰⁷Pb/²⁰⁶Pb age of 1883 ± 9 Ma, interpreted as the time of the post-peak cooling. Therefore, it can be inferred that the Taihua Complex has been involved in the collision between the Western and Eastern Blocks of the NCC in the late Paleoproterozoic. Based on previously published data, we propose that the Taihua Complex records the pressure peak metamorphic ages of ca. 1.95 Ga and cooling ages of ca. 1.93(1.92) ∼ 1.80 Ga. The main crustal thickening process possibly occurs at ca. 1.95 Ga, followed by uplifting, and final cooling from ca. 1.93(1.92) − 1.80 Ga.

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来源期刊

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

期刊介绍： Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.