Structural Evolution of Northern Jiangnan Uplift: Evidence from ESR Dating

Abstract

Abstract:

Thirty-five samples from tectogenetic α quartz veins in northern Jiangnan uplift have been studied by using ESR dating method. The results show that the ESR ages of α quartz veins from northern Jiangnan uplift change between 195.8 Ma and 3.4 Ma, mainly from 75 Ma to 3.4 Ma (Himalayan). Combined ESR dating results with other geological evidence, the evolution history of northern Jiangnan uplift in the Cenozoic can be classified into two phases. The former is extend and faulted depressions stage (75-61.5 Ma).Normal faults and fault basins formed during this time. The latter is squeezing uplift stage (43.2-3.4 Ma). Its main feature is gravitational detachment structure. The Indosinian and Yanshanian structures had been intensely reconstructed during Himalayan. Entire eastern China experienced distinct tectonic movement, including southern North China, mid-lower Yangtze and northern Jiangnan uplift. The ESR dating results are consistent with geological evidence,which checked up the dependability of ESR dating.

Key words: ESR dating, Jiangnan uplift, Cenozoic, Himalayan, tectonic evolution

CLC Number:

SHU Qing-Bo, YANG Kun-Guang, CHENG Wan-Qiang. Structural Evolution of Northern Jiangnan Uplift: Evidence from ESR Dating[J]. Geoscience, 2011, 25(1): 31-38.

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