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LA-ICP-MS Zircon U-Pb dating of Early Jurassic granite basement in Chagan Area of the Northest Guangdong and its geological implications
LA-ICP-MS U-Pb que data de principios del Jurásico en sótano de granito en el área de Chagan en el noreste de Guangdong y sus implicaciones geológicas
DOI:
https://doi.org/10.15446/esrj.v24n2.87364Keywords:
volcanic fault basins, Wenxiang granite, LA-ICP-MS, isotopic dating, late Early Jurassic (en)cuencas de fallas volcánicas, granito Wenxiang, LA-ICP-MS, datación isotópica, Jurásico temprano tardío (es)
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Rencha basin is one of the typical Mesozoic-Cenozoic volcanic fault basins in northeastern Guangdong. The borehole data indicate that the basement is mainly composed of Paleozoic metamorphic rocks and Wenxiang granite. At present, the basement granite has been lacking in precise years. In order to discuss its formation age and improve the understanding of the geological evolution of the area, LA-ICP-MS zircon U-Pb isotopic dating of Wenxiang granite cores from two boreholes in the Chagan area of the basin is carried out, and the two harmonic ages are 179+1 Ma and 186 Ma, respectively. The results show that the basement Wenxiang granite in Rencha Basin was formed in late Early Jurassic, which is the product of the first volcanic activity of Yanshan. This age not only deepens the understanding of the formation and evolution of Rencha Basin, but also provides new chronological data for the lack of magmatic activity in the Early Jurassic in northeastern Guangdong, China.
La cuenca de Rencha es una de las cuencas típicas de fallas volcánicas mesozoico-cenozoicas en el noreste de Guangdong. Los datos del pozo indican que el sótano está compuesto principalmente por rocas metamórficas paleozoicas y granito Wenxiang. En la actualidad, el granito del sótano ha faltado en años precisos. Para discutir su edad de formación y mejorar la comprensión de la evolución geológica del área, se lleva a cabo la datación isotópica U-Pb de circón LA-ICP-MS de núcleos de granito Wenxiang de dos pozos en el área de Chagan de la cuenca, y las dos edades armónicas son 179 + 1 Ma y 186 Ma, respectivamente. Los resultados muestran que el granito Wenxiang del sótano en la cuenca Rencha se formó a finales del Jurásico temprano, que es el producto de la primera actividad volcánica de Yanshan. Esta edad no solo profundiza la comprensión de la formación y evolución de la Cuenca Rencha, sino que también proporciona nuevos datos cronológicos para la falta de actividad magmática en el Jurásico Temprano en el noreste de Guangdong, China.
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