大别造山带在大陆裂解、地壳的俯冲-折返及山根垮塌期间的多期部分熔融作用

刘贻灿; 杨阳; 姜为佳; 李远

doi:10.3799/dqkx.2019.237

Volume 44 Issue 12

Dec. 2019

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Article Navigation > Earth Science > 2019 > 44(12): 4195-4202

Liu Yican, Yang Yang, Jiang Weijia, Li Yuan, 2019. Diverse Partial Melting during Continental Rifting, Subduction-Exhumation and Mountain-Root Collapse in the Dabie Orogen, Central China. Earth Science, 44(12): 4195-4202. doi: 10.3799/dqkx.2019.237

Citation:

Liu Yican, Yang Yang, Jiang Weijia, Li Yuan, 2019. Diverse Partial Melting during Continental Rifting, Subduction-Exhumation and Mountain-Root Collapse in the Dabie Orogen, Central China. Earth Science, 44(12): 4195-4202. doi: 10.3799/dqkx.2019.237

Citation:

Liu Yican, Yang Yang, Jiang Weijia, Li Yuan, 2019. Diverse Partial Melting during Continental Rifting, Subduction-Exhumation and Mountain-Root Collapse in the Dabie Orogen, Central China. Earth Science, 44(12): 4195-4202. doi: 10.3799/dqkx.2019.237

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Diverse Partial Melting during Continental Rifting, Subduction-Exhumation and Mountain-Root Collapse in the Dabie Orogen, Central China

doi: 10.3799/dqkx.2019.237

CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

Received Date: 2019-08-05
Publish Date: 2019-12-15

Abstract

Abstract

The Dabie orogenic belt consists of a series of fault-bounded lithotectonic units with various metamorphic grades and evolutional histories related to continental subduction and exhumation. Based on the existing controversy and problem in the region, this study performed the detailed field investigation, and petrological, element-isotope geochemical and zircon geochronological researches on the granitic rocks from different subducted slices such as the Susong metamorphic zone (SZ), Central Dabie ultrahigh-pressure metamorphic zone (CDZ) and North Dabie complex zone (NDZ). The results suggest that:(1) the precursor ages of the granitic gneisses in the SZ can be divided into two types, i.e. the Late Archean (2.5-2.7 Ga) and the Neoproterozoic (770-830 Ma), and Neoproterozoic protoliths of them were derived from remelting of the Late Archean rocks with~2.0 Ga metamorphic overprinting during the Neoproterozoic continental rifting; (2) the granitic orthogneisses in the CDZ at least contain two kinds of precursor ages of~750 Ma and 780-800 Ma with different petrogenesis, which underwent two episodes of partial melting at~230 Ma and~220 Ma during the Triassic subduction and exhumation; (3) there are a variety of leucosomes, formed by high-T decompression-induced biotite dehydration melting during the initial stage of exhumation at~209 Ma and water-fluxed heating melting corresponding to the mountain-root collapse at 110-145 Ma, within the migmatites in the NDZ; (4) the meta-diorites from the NDZ were discovered and are documented to be resulted from partial melting of the Triassic deep-subducted mafic lower-crustal rocks during the mountain-root collapse in the Early Cretaceous. Thus, all these provide new constraints on diverse partial melting during the Neoproterozoic continental rifting, the Triassic crustal subduction-exhumation and the Cretaceous mountain-root collapse in the Dabie orogen, Central China.
- continental rifting,
- crustal subduction-exhumation,
- mountain-root collapse,
- partial melting,
- Dabie orogen,
- petrology

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References(31)

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