Citation: | WANG Biren, TENG Chao, BAI Xiangdong, GUAN Chengyao, YUAN Sihua, ZHANG Xiaofei, YANG Xinjie. 2024. Age, Geochemistry and Geological Significance of an Early Neoproterozoic Porphyritic Granite in the Jianshanzi Area of the Beishan Orogenic Belt. Northwestern Geology, 57(6): 44-57. doi: 10.12401/j.nwg.2024074 |
The geochronological and geochemical data of an early Neoproterozoic porphyritic granite in the Jianshanzi Area of the Beishan Orogenic Belt has been present. Combined with published geochemical data of contemporaneous granitic rocks, their magma sources and the tectonic affinity between the Precambrian basement in the southern Beishan and Tarim Cration are discussed. Two samples from the porphyritic granite have zircon U-Pb ages of (901±5) Ma and (935±3) Ma, respectively, indicating that it was formed during the early Neoproterozoic. Samples from the porphyritic granite contain K-feldspar phenocrysts with high SiO2 contents (70.41%~76.05%) and peraluminous characteristics (A/CNK=1.01~1.21), and exhibit similar chondrite-normalized REE patterns with LREE-enrichment and pronounced negative Eu anomalies (δEu = 0.30~0.46), and show positive Rb, Th, U and K anomalies, negative Ba, Nb, Ta, Sr, P and Ti anomalies in the primitive mantle-normalized trace-element diagram, and have evolved zircon εHf(t) values of −5.0 to −1.4 and two-stage Hf model ages of 2.08~1.61 Ga. All these geochemical characteristics suggest that the porphyritic granite is a typical crustal-derived granite, indicating an older crustal reworking event. Together with the reported data, the Precambrian basement of the southern Beishan experienced both Mesoproterozoic crustal growth and early Neoproterozoic crustal reworking events with the zircon εHf(t) values of granitic rocks plotting within the crustal evolution trend defined by 2.1~1.3 Ga crustal material, indicating the absence of an Archean basement in the southern Beishan, and therefore it may not have tectonic affinity with the Tarim craton with an Archean crystalline basement.
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(a) Simplified tectonic sketch map of the Central Asian Orogenic Belt showing the location of the Beishan Orogenic Belt and (b) distribution of the Beishan complex and the known Precambrian rocks in the Beishan Orogenic Belt
Sketch geological map and sampling location in the Jianshanzi area, eastern Beishan Orogenic Belt
(a) Field outcrop and (b) photomicrograph for the porphyritic granite in the Jianshanzi area
(a, c) Cathodoluminescence images of representative zircon grains and (b, d) zircon U-Pb concordia diagrams from the porphyritic granite in the Jianshanzi area
The zircon εHf(t) versus age plot for the sample TW1003 from the porphyritic granite in the Jianshanzi area
(a) Total alkali versus silica diagram, (b) SiO2 vs K2O plot and (c) A/NK vs A/CNK diagram of the porphyritic granite in the Jianshanzi area.
(a) C1 chondrite-normalized REE patterns and (b) primitive mantle-normalized incompatible trace element variation diagrams of the porphyritic granite in the Jianshanzi area
The zircon εHf(t) versus age (Ma) plot for the Mesoproterozoic and Neoproterozoic granitic rocks in the southern Beishan Orogenic Belt