地质通报2017，Vol.36Issue(5)：715-725,11.
湖北大洪山打鼓石群沉积时限——来自碎屑锆石U-Pb年龄的证据
Depositional age of the Dagushi Group in the Dahong Mountain, Hubei Prov?ince:Evidence from U-Pb ages of detrital zircons
摘要
Abstract
The Dagushi Group, spread on the northern margin of the Yangtze Craton, is a well-preserved succession of the Mesopro?terozoic strata in South China, unconformably overlain by the Huashan Group. It is generally considered to have the same age as the Shennongjia Group. However, the isotopic geochronological evidence of material source is relatively insufficient. Detrital zircon U-Pb dating results of sandstone from Taiyangsi Formation on the bottom of Dagushi Group are first reported in this paper. The dating re?sults demonstrate that the oldest and youngest ages are 3.1~3.2Ga and 1124Ma,respectively. There are two age peaks of 2.65Ga and 2.75Ga in the detrital zircon. Its detrital zircon ages are consistent with the multi-period magmatic activities in Kongling Complex and Yangpo Complex before Neoproterozoic. Nevertheless, the Shennongjia Group, widely distributed in western Hubei Province, was deposited from 1.4Ga to 1.1Ga with three age peaks of 1.6Ga, 2~2.1Ga and 2.7~2.8Ga. These data indicate that the Dagushi Group was deposited obviously later than the Shennongjia Group, and hence they do not belong to the same stratigraphic sequence.关键词
大洪山/打鼓石群/碎屑锆石/神农架群/崆岭杂岩/杨坡杂岩Key words
Dahongshan/Dagushi Group/detrital zircon/Shennongjia Group/Kongling Complex/Yangpo Complex分类
天文与地球科学引用本文复制引用
刘浩,徐大良,魏运许,邓新,彭练红..湖北大洪山打鼓石群沉积时限——来自碎屑锆石U-Pb年龄的证据[J].地质通报,2017,36(5):715-725,11.基金项目
中国地质调查局项目《湘西-鄂西成矿带关键地区地质调查》(编号:12120113061700)、《武当-桐柏-大别成矿带关键地区地质调查》(编号:12120113067900) （编号:12120113061700）
