IGGCAS OpenIR  > 岩石圈演化国家重点实验室
Petrogenesis of Early Cretaceous granites and associated microgranular enclaves in the Xiabie Co area, central Tibet: Crust-derived magma mixing and melt extraction
Yang, Zong-Yong1,2; Wang, Qiang1,2,3; Yang, Jin-Hui4; Dan, Wei1; Zhang, Xiu-Zheng1; Ma, Lin1; Qi, Yue1,2; Wang, Jun1,2; Sun, Peng1,2
2019-12-15
Source PublicationLITHOS
ISSN0024-4937
Volume350Pages:22
AbstractMultiple petrogenesis models have been proposed for granitic rocks and the mafic microgranular enclaves (MMES) hosted in them. The mantle and crust-derived magma mixing/mingling process was widely suggested for the formation of MMES or the host granitoids. However, whether the mixing between magmas derived from different crustal sources may also form microgranular enclaves (MEs, not restricted to mafic) or the host granites remain unclear. Here, we report petrological, geochemical, and zircon in situ Hf-O isotopic data for MEs and their host granites in the northern Nyima area, southern Qjangtang terrane (SQT), central Tibet. The host granitic rocks consist of amphibole-bearing biotite granites and syenogranite, minor granodiorite and aplite veins, and MEs comprising diorite and granodiorite. Host rocks and MEs are contemporaneous and were generated in the Early Cretaceous (similar to 120 Ma). Host granitoid samples are high-K talc-alkaline rocks and have high SiO2 (66-78 wt%) and low MgO (<1.14 wt%). They have enriched whole-rock epsilon Nd(t) (-1.82 to -3.06), and variable zircon epsilon Hf(t) (+0.64 to +5.12) and delta O-18 (7.35 to 9.61 parts per thousand) values. The host granodiorites contain some mafic mineral-rich clots and lower silica contents than the biotite granites. They exhibit distinctive geochemical patterns (such as high K2O > 5 wt%, high Zr >500 ppm with Zr/Hf ratios >45, and high Ba >400 ppm), implying biotite and zircon concentrations. Combining this information with embayed feldspars, curved biotites, and closely spaced feldspar grains, we suggest that liquid loss resulted from crystal compaction or filter pressing. Both the fine-grained syenogranites and aplite veins exhibit high SiO2 and Rb/Sr ratios in addition to low Zr/Hf ratios and Zr and Ba concentrations with remarkably negative Eu anomalies, indicating that they are highly differentiated melts extracted from felsic crystal mush. Such a crystal mush is possibly represented by the biotite granites. Gradual contact relationships between variable granitic phases indicate that melt extraction and crystal concentration were coeval. Residual melt extraction from the crystal mush was facilitated by mush remobilization resulting from magma replenishment. We suggest that for the host rocks, the biotite granites were mainly derived by partial melting of ancient crust, and the granodiorites most likely resulted from the magma mixing/mingling that might be accompanied with the loss of melts, the fine-grained syenogranites and aplites represent highly evolved residual melts. MEs are geochemically characterized by intermediate to felsic compositions (SiO2 = 56.3-67.8 wt%), with low MgO (<4 wt%) and Mg# (< 53) and low mantle compatible trace element (Cr and Ni) contents. They exhibit enriched whole-rock Nd (epsilon Nd(t) = -0.36 to -2.71), depleted zircon epsilon Hf(t) (+0.51 to +5.68) and high delta O-18 values (7.45 to 9.57 parts per thousand), except for one sample with comparable whole-rock epsilon Nd(t) (-1.32), relatively high zircon epsilon Hf(t) (+5.05 to +7.11) and delta O-18 (6.09 to 7.10 parts per thousand) values. MEs exhibit evidence for quenched magma crystallization, chemical exchange, mineral disequilibrium and mass transfer, indicating inefficient magma mixing/mingling. Mafic minerals from MEs were in equilibrium with evolved melts rather than mantle-derived primitive melts. Given the substantial absence of contemporaneous basaltic rocks from the SQT and the relatively high SiO2 and low MgO contents and crust-like zircon stable oxygen isotope of MEs, we propose that they most likely resulted from the mixing/mingling of diverse crust-derived magmas. Therefore, our study provides important evidence for crust-derived magma mixing and melt extraction from mush. (C) 2019 Elsevier B.V. All rights reserved.
KeywordMelt extraction Magma mixing Granite Microgranular enclave Tibet
DOI10.1016/j.lithos.2019.105199
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS ; CAS ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; National Key R&D Program of China ; National Key R&D Program of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS ; CAS ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; National Key R&D Program of China ; National Key R&D Program of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS ; CAS ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; National Key R&D Program of China ; National Key R&D Program of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS ; CAS ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project)
WOS KeywordCALC-ALKALINE GRANITOIDS ; HF ISOTOPIC COMPOSITIONS ; A-TYPE GRANITES ; U-PB ZIRCON ; PERALUMINOUS GRANITOIDS ; CRYSTAL ACCUMULATION ; CONTINENTAL GROWTH ; SPREADING RIDGE ; MIDDLE SEGMENT ; NUJIANG SUTURE
Language英语
Funding ProjectNational Key R&D Program of China[2016YFC0600407] ; Second Tibetan Plateau Scientific Expedition and Research (STEP)[2019QZKK0702] ; National Natural Science Foundation of China[91855215] ; National Natural Science Foundation of China[41630208] ; Chinese Academy of Sciences (CAS)[XDA2007030402] ; CAS[QYZDJ-SSW-DQCO26] ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project)[135TP201601]
Funding OrganizationNational Key R&D Program of China ; National Key R&D Program of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS ; CAS ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; National Key R&D Program of China ; National Key R&D Program of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS ; CAS ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; National Key R&D Program of China ; National Key R&D Program of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS ; CAS ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; National Key R&D Program of China ; National Key R&D Program of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) ; Chinese Academy of Sciences (CAS) ; CAS ; CAS ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project) ; Guangzhou Institute of Geochemistry, CAS (GIGCAS 135 Project)
WOS Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000504504700004
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95866
Collection岩石圈演化国家重点实验室
Corresponding AuthorWang, Qiang
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Yang, Zong-Yong,Wang, Qiang,Yang, Jin-Hui,et al. Petrogenesis of Early Cretaceous granites and associated microgranular enclaves in the Xiabie Co area, central Tibet: Crust-derived magma mixing and melt extraction[J]. LITHOS,2019,350:22.
APA Yang, Zong-Yong.,Wang, Qiang.,Yang, Jin-Hui.,Dan, Wei.,Zhang, Xiu-Zheng.,...&Sun, Peng.(2019).Petrogenesis of Early Cretaceous granites and associated microgranular enclaves in the Xiabie Co area, central Tibet: Crust-derived magma mixing and melt extraction.LITHOS,350,22.
MLA Yang, Zong-Yong,et al."Petrogenesis of Early Cretaceous granites and associated microgranular enclaves in the Xiabie Co area, central Tibet: Crust-derived magma mixing and melt extraction".LITHOS 350(2019):22.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Yang, Zong-Yong]'s Articles
[Wang, Qiang]'s Articles
[Yang, Jin-Hui]'s Articles
Baidu academic
Similar articles in Baidu academic
[Yang, Zong-Yong]'s Articles
[Wang, Qiang]'s Articles
[Yang, Jin-Hui]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Yang, Zong-Yong]'s Articles
[Wang, Qiang]'s Articles
[Yang, Jin-Hui]'s Articles
Terms of Use
No data!
Social Bookmark/Share
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit Add to Technorati
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.