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SHRIMP Zircon U-Pb Dating on the Early Cretaceous Volcanics in Zhangwu-Heishan Area, West Liaoning Province, China and its Geological Significance
Datación U-Pb SHRIMP de rocas volcánicas del Cretácico inferior en el área de Zhangwu-Heishan, al occidente de la provincia china de Liaoning y su importancia geológica
DOI:
https://doi.org/10.15446/esrj.v28n3.113685Keywords:
West Liaoning Province, Zhangwu-Heishan Area, Mesozoic Volcanic Rock, SHRIMP U-Pb Isotopic Age, Geological Significance (en)occidente de la provincia Liaoning, área de Zhangwu-Heishan, rocas volcánicas del Mesozoico, datación isotópica SHRIMP U-Pb, significación geológica (es)
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Due to special structural location and the output of precious fossils, west Liaoning Province has become a hot subject of research. The horizon and age of volcanic rock play an important role in understanding biostratigraphy, structural and sedimentary evolution of west Liaoning Province and local coal exploration. During this work, over 20 volcanic rock samples were collected from Fuxin-Yixian Basin and Zhangwu-Heishan Area, and 11 samples were performed SHRIMP U-Pb isotope analysis. Combining the new data obtained with the age of Mesozoic volcanic rock in west Liaoning Province, Cretaceous volcanic activities in west Liaoning Province can be divided into 5 stages, namely 132±1Ma, 126±1Ma, 122±2Ma, 115±2Ma and 100±5Ma. In reference to field observation, the volcanic rock in Zhangwu-Heishan Area includes 3 suites of early Cretaceous volcanic rock and 1 suite of Paleogene olivine-enclave-bearing basalt. Overlying Jiufotang Formation is a volcanic rock series, which occurs at Jianguo of Fuxin, Yaocangtu of Heishan County, Baizitun in the east of Faku County and more, is temporarily named as Gangtaishan Formation or is incorporated into Jiufotang Formation. Igneous rock series of Dalinghe Formation (Daxingzhuang Formation) overlying Sunjiawan Formation of early Cretaceous System wasn’t found in Fuxin-Yixian Basin and Zhangwu-Heishan Area, so it is proposed that this formation is absent in the study area. The stratigraphic succession of Zhangwu-Heishan Area was clarified and the conclusion that no Cretaceous coal seam can be found below volcanic rock in Zhangwu-Heishan Area was drawn. The inherited zircon of Archean Eon was found in volcanic rock samples from Yixian Formation of early Cretaceous System.
Debido a su ubicación estructural especial y el desarrollo de fósiles valiosos, el occidente de la provincia china de Liaoning se ha convertido en un centro de interés para la investigación. El horizonte y la edad de las rocas volcánicas juegan un papel importante en el conocimiento de la bioestratigrafía y la evolución estructural y sedimentaria del occidente de la provincia y de la exploración local de carbón. Durante este trabajo más de veinte muestra de rocas volcánicas recolectadas en la cuenca de Fuxin-Yixian y en el área de Zhangwu-Heishan, y a once de estas muestras se les realizaron análisis de datación isotópica SHRIMP U-Pb (Datación U-Pb a través de la Microsonda de Iones de Alta-Resolución). Al combinar la nueva información obtenida con la edad de las rocas volcánicas del Mesozoico en el occidente de la provincia de Liaoning, las actividades volcánicas del cretácico pueden dividirse en cinco etapas: 132±1Ma, 126±1Ma, 122±2Ma, 115±2Ma y 100±5Ma. En cuanto a la observación de campo, las rocas volcánicas del área de Zhangwu-Heishan incluyen tres patrones de rocas volcánicas del Cretácico inferior y un patrón de basalto paleógeno con enclave de olivino. Una serie de rocas volcánicas cubre la formación Jiufotang, las cuales se encuentran en Jianguo de Fuxin, condado Yaocangtu de Heishan, y Bazitun, en el oriente del condado Faku, y se denomina temporalmente formación Gangtaishan o se incorpora a la formación Jiufotang. Las series de rocas igneas de la formación Dalinghe (formación Daxingzhuang) que se superponen a la formación Sunjiawan del sistema cretácico inferior no fueron encontradas en la cuenca de Fuxin-Yixian ni en el área Zhangwu-Heishan, por lo que se propone que esta formación es ausente en el área de estudio. La sucesión estratigráfica del área de Zhangwu-Heishan fue clarificada y surgió la conclusión de que una veta de carbón del Cretácico podría ser hallada bajo sus rocas volcánicas. El circón heredado del Eón Arcaico se encontró en muestras de roca volcánica de la formación Yixian, del sistema cretácico temprano.
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