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Petrogenesis and Geological Significance of Rapakivi-textured Granodiorite from Dangjiasi Pluton in the Northern Margin of Gonghe Basin, Qinghai, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2025年第02期
Page:
176-198
Research Field:
基础地质与矿床地质
Publishing date:

Info

Title:
Petrogenesis and Geological Significance of Rapakivi-textured Granodiorite from Dangjiasi Pluton in the Northern Margin of Gonghe Basin, Qinghai, China
Author(s):
LI Wei1;  DUAN Feng-hao2; 3*;  ZHI Qian4;  PENG Nan-he1;  WANG Pan-long1;  WANG Qian1;  PENG Jian-bing2; 3
(1. School of Earth Science and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 2. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China; 3. Academy of Yellow River Sciences of Shaanxi Province, Chang'an University, Xi'an 710054, Shaanxi, China; 4. Shaanxi Hydrogeological, Engineering and Environment Geological Survey Center, Shaanxi Institute of Geological Survey, Xi'an 710068, Shaanxi, China)
Keywords:
geochemistry;  zircon U-Pb age;  granodiorite;  petrogenesis;  Middle Triassic;  magma mixing;  Gonghe Basin
PACS:
P581; P597+.3
DOI:
10.19814/j.jese.2025.01023
Abstract:
Late Permian-Triassic igneous rocks are widely developed around Gonghe Basin, and their age and petrogenesis are genetically linked to the subduction-collision process of Zongwulong ocean. Based on the newly discovered rapakivi-textured granodiorites and their dioritic enclaves within Dangjiasi pluton in the north side of Longyangxia reservoir, an integration of methods including petrology, geochemistry and geochronology was performed. The results show that LA-ICP-MS zircon U-Pb age of rapakivi-textured granodiorite is(245.8±1.3)Ma; the rapakivi-textured granodiorites are high-K calc-alkaline weakly peraluminous I-type granites, which exhibit slightly high SiO2 contents(65.9%-71.1%)and Mg# values(44.6-49.6); they are also characterized by enrichment of LILEs(Rb, K, Th, U)and LREEs, depletion of HREEs and HFSEs(Nb, Ta, Ti), and moderate negative Eu anomalies(0.46-0.73); their trace element characteristics, coupled with disequilibrium textures of rapakivi feldspar, dissolution of feldspar and plagioclase enclosed within amphibole, indicate that the rapakivi-textured granodiorites are mainly derived from partial melting of mafic lower crust with additional input of mantle-derived component; the dioritic enclaves are irregularly ellipsoidal in shape, and develop chilled border and acicular apatites; they also possess lower SiO2 contents(61.9%-63.4%), higher Mg# values(57.4-59.4), and flatter rare earth element(REE)patterns; in combination with field and petrological observations and geochemical characteristics, the rapakivi-textured granodiorites and dioritic enclaves are inferred as products by different percentage mixing of mantle-derived magma and basaltic lower crust-derived felsic magmas. In general, the Middle Triassic magmatic activity in the northern margin of Gonghe Basin might be related to the underplating of mantle-derived magma and magma mixing induced by the southward subduction of Zongwulong ocean.

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Last Update: 2025-03-20