豫南伏牛山余脉铜山岩体锆石U-Pb定年、地球化学特征及其地质意义

doi:10.13278/j.cnki.jjuese.20190257

Abstract

Abstract: The Tongshan rock mass is located at the south of stretching branch of Funiu Mountain in the southern margin of the North China craton, which is composed of medium-grained biotite syenogranite and monzonitic granite. The study on the zircon U-Pb dating and petro-genesis of the Tongshan rock mass is significant for understanding the Yanshanian deep tectonic evolution of the southern margin of the North China craton. The LA-ICP-MS zircon U-Pb dating results of the Tongshan rock mass fall into two groups of (147.0±4.3)-(144.1±4.4) Ma (n=5) and (133.0±3.9)-(127.4±3.6) Ma (n=21), characterized by a bimodal zircon age spectrum with weighted averages of (145.5±4.5) Ma and (130.6±1.8) Ma, respectively. The age of (145.5±4.5) Ma suggests the magmatism concealed around the Tongshan rock mass, and the age of (130.6±1.8) Ma represents its formation of the Tongshan rock mass in the Early Cretaceous. The Tongshan rock mass is characterized by higher SiO₂ and alkali, lower MgO and CaO, and its compositional spots fall into the high-K calc-alkaline series in the w(K₂O)-w(SiO₂) diagram. The peaks of Rb, Th, Zr and Hf and troughs of Sr, P and Ti are shown in the spider diagram. The total rare earth elements are from 43.07×10^-6 to 173.14×10^-6 with the (La/Yb)_N ratios of 1.97-19.58. In the chondrite-normalized REE patterns, the Tongshan rock mass has the characteristics of LREE-enrichment and HREE depletion with Eu negative anomalies ranging from 0.33 to 0.73. It is suggested that the compositional change of the Tongshan rock mass was resulted mainly from the partial melting of source rocks as the compositional trend shown in the (La/Yb)_N-w(La_N) diagram. The partial melting source of the Tongshan rock mass is located in the amphibolite-facies with a crust thickness of 40 km, and its residual phases of the partial melting source includes mainly hornblende and plagioclase. Due to the lithosphere delamination of the Sanhedian-Jigongshan area in the Tongbai Mountain at about 131 Ma in the Early Cretaceous, the deep fluids/magmas discharged rapidly, intruded into the incompletely consolidated magma/fluid reservoir, crystallized the 145 Ma zircon grains, and finally formed the Tongshan granite with the mixed materials in the activation reservoir as shown on the bimodal zircon age spectrum. The Tongshan rock mass was almost the simultaneous magmatic response to the Sanhedian-Jigongshan lithosphere delamination, and the related magma activities occurred not only on the Tongbai-Dabie orogenic belt, but also on the northern Qinling orogenic belt and the southern margin of the North China craton.

Key words: Tongshan rock mass, U-Pb isotopic dating, geochemical, lithosphere delamination, underplating, stretching branch of the Funiu Mountain, southern margin of the North China craton, southern Henan Province

CLC Number:

P588.12

Liang Tao, Lu Ren. LA-ICP-MS Zircon U-Pb Dating, Geochemical Features and Geological Implications of Tongshan Rock Mass in Stretching Branch of Funiu Mountain, Southern Henan Province[J].Journal of Jilin University(Earth Science Edition), 2021, 51(2): 400-415.

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[10]	Zhao Yuyan, Li Bing, Lu Jilong, Hao Libo, Zhao Yu, Wang Dongming. Geochemical and Geophysical Information Integration Technology for Geological Mapping at Shallow Overburden Area in Northeast China [J]. Journal of Jilin University(Earth Science Edition), 2018, 48(1): 318-333.
[11]	Tan Hongqi, Liu Yuping. Genesis of Amphibolite in Mengdong Group-Complex in Southeastern Yunnan and Its Tectonic Significance [J]. Journal of Jilin University(Earth Science Edition), 2017, 47(6): 1763-1783.
[12]	Chen Zhijun, Ren Laiyi, He Yonghong, Liu Huchuang, Song Jian. Geochemical Characteristics and Formation Environment of High-Quality Hydrocarbon Source Rocks of Yingen Formation in Hari Sag,Yingen-Ejinaqi Basin [J]. Journal of Jilin University(Earth Science Edition), 2017, 47(5): 1352-1364.
[13]	Xiao Fan, Chen Jianguo. Application of PPC Model Combined with RCGA to Identify and Extract Geochemical Anomaly [J]. Journal of Jilin University(Earth Science Edition), 2017, 47(4): 1319-1330.
[14]	Dong Weihong, Meng Ying, Wang Yushan, Wu Xiancang, Lü Ying, Zhao Hui. Hydrochemical Characteristics and Formation of the Shallow Groundwater in Fujin,Sanjiang Plain [J]. Journal of Jilin University(Earth Science Edition), 2017, 47(2): 542-553.
[15]	Li Fulai, Xiao Fei, Meng Fanchao, Ren Zeying. Geochemical Characteristics and Implication for Provenance of Upper Permian Linxi Formation Clastic Rocks in Solonker Area, Inner Mongolia [J]. Journal of Jilin University(Earth Science Edition), 2016, 46(6): 1769-1780.