| China Geological Survey Chinese Academy of Geological Sciences | Host |
| 科学出版社 | Publish |
| Citation: |
WANG Cunzhi, HUANG Zhizhong, ZHAO Xilin, CHU Pingli, HUANG Wencheng, SONG Shiming, XU Yang, YANG Chao. 2021. Geochronology, geochemistry and petrogenesis of early Cretaceous Yaocun A-type granite in the Lower Yangtze region[J]. Geology in China, 48(2): 549-563. doi: 10.12029/gc20210214
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Geochronology, geochemistry and petrogenesis of early Cretaceous Yaocun A-type granite in the Lower Yangtze region
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Abstract
The Yaocun pluton in Southern Anhui Province, lithologically consisting mainly of medium-to coarse-grained syenogranite in its centre and fine-grained porphyritic syenogranite on its margin, is outcropped around the northeastern Jiangnan orogeny of the Lower Yangtze region. This paper reports detailed study results of its the LA-ICP-MS zircon U-Pb dating, major elements, trace elements, whole-rock Nd isotopic compositions and zircon Hf isotopic compositions. LA-ICP-MS zircon U-Pb ages show that the Yaocun pluton, as the product of magmatic activity in the late Yanshanian period, was emplaced at 127.6±1.4Ma. The studies of petrography and geochemistry of this rock indicate that it is A-type granite, and is characterized by rich silica, high iron, high zircon saturation temperatures, enrichment of Rb, Th, U, K and Pb, depletion of Ba, Nb, Sr and Ti, and significant negative Eu anomalies (Eu/Eu*=0.22-0.46). Its εNd(t) and εHf(t) values range from -6.2 to -5.7 and from -13.9 to -5.0 respectively, and the calculated two-stage model ages (TDM2) of Nd and Hf isotopes from 1439 Ma to 1532 Ma and from 1508 Ma to 2062 Ma respectively. Combined with the results of regional geological research, it is suggested that the Yaocun pluton might be formed by the Mesoproterozoic crust remelting under extension-tension environment after the subduction of the Paleo-Pacific plate during the Early Cretaceous.
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WANG Cunzhi, HUANG Zhizhong, ZHAO Xilin, CHU Pingli, HUANG Wencheng, SONG Shiming, XU Yang, YANG Chao. 2021. Geochronology, geochemistry and petrogenesis of early Cretaceous Yaocun A-type granite in the Lower Yangtze region[J]. Geology in China, 48(2): 549-563. doi: 10.12029/gc20210214
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Figure 1.
Schematic tectonic map of Lower Yangtze region showing the location of the studied area(a); tectonic sketch map of the studied area(b, after Chen Fang et al., 2014); and geological sketch map of the Yaocun pluton(c)
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Figure 2.
Field and microscope photographs of the Yaocun pluton
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Figure 3.
Cathodoluminescence (CL) images of representative zircons(a) and U-Pb Concordia diagrams of samples(b) from the Yaocun
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Figure 4.
Alkali vs. silica (TAS) diagram (a, after Middlemost, 1994) and SiO2-K2O diagram(b, after Peccerillo et al., 1976) of the Yaocun pluton
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Figure 5.
Chondrite-normalized REE distribution diagram of Yaocun pluton (a) and primitive mantle-normalized trace element spider (b) Chondrite-normalized rare earth element (a) and primitive-mantle-normalized trace element date(b) for samples of the Yaocun pluton.
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Figure 6.
Chemical discrimination diagrams of the Yaocun A-type granitic pluton: (a) Na2O vs. K2O; (b) FeOT/(FeOT+MgO) vs.SiO2; (c) (K2O+Na2O) /CaO vs. 10, 000 Ga; (d) Nb vs. 10, 000 Ga (a after Collins et al., 1982; b after Frost and Frost, 2011; c and d after Whalen et al., 1987). Symbols are the same as in Fig. 4
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Figure 7.
(a) La vs. (La/Sm)N; (b) Zr vs. Zr/Nb discrimination diagram of the Yaocun A-type granitic pluton (Symbols are the same as Fig. 4)
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Figure 8.
(a) Molar Al2O3/(MgO + FeOT) vs. CaO/(MgO + FeOT) and (b) Al2O3/TiO2 vs. CaO/Na2O diagrams of the Yaocun A-type granitic pluton (a after Altherr et al., 2000 and b after Sylvester., 1998). Symbols are the same as in Fig. 4
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Figure 9.
εNd(t) vs. t diagram (a, after Chen & Jahn, 1998) and εHf(t) vs. t diagram (b, after Zhang & Zheng, 2013; Wang et al., 2013) of the Yaocun pluton