A large-scale high-pressure granulite belt (HPGB), more than 700 km long, is recognized within the metamorphic basement of the North China craton. In the regional tectonic framework, the Hengshan-Chengde HPGB is locat...A large-scale high-pressure granulite belt (HPGB), more than 700 km long, is recognized within the metamorphic basement of the North China craton. In the regional tectonic framework, the Hengshan-Chengde HPGB is located in the central collision belt between the western block and eastern block, and represents the deep crustal structural level. The typical high-pressure granulite (HPG) outcrops are distributed in the Hengshan and Chengde areas. HPGs commonly occur as mafic xenoliths within ductile shear zones, and underwent multipile deformations. To the south, the Hengshan-Chengde HPGB is juxtaposed with the Wutai greenstone belt by several strike-slip shear zones. Preliminary isotopic age dating indicates that HPGs from North China were mainly generated at the end of the Neoarchaean, assocaited with tectonic assembly of the western and eastern blocks.展开更多
Thermochronometer data offer a powerful tool for quantifying a wide range of geologic processes,such as the deformation and erosion of mountain ranges,topographic evolution,and hydrocarbon maturation.With increasing i...Thermochronometer data offer a powerful tool for quantifying a wide range of geologic processes,such as the deformation and erosion of mountain ranges,topographic evolution,and hydrocarbon maturation.With increasing interest to quantify a wider range of complicated geologic processes,more sophisticated techniques are needed.This paper is concerned with an inverse problem method for interpreting the thermochronometer data quantitatively.Two novel models are proposed to simulate the crustal thermal fields and paleo mountain topography as a function of tectonic and surface processes.One is a heat transport model that describes the change of temperature of rocks;while the other is surface process model which explains the change of mountain topography.New computational algorithms are presented for solving the inverse problem of the coupled system of these two models.The model successfully provides a new tool for reconstructing the kinematic and the topographic history of mountains.展开更多
文摘A large-scale high-pressure granulite belt (HPGB), more than 700 km long, is recognized within the metamorphic basement of the North China craton. In the regional tectonic framework, the Hengshan-Chengde HPGB is located in the central collision belt between the western block and eastern block, and represents the deep crustal structural level. The typical high-pressure granulite (HPG) outcrops are distributed in the Hengshan and Chengde areas. HPGs commonly occur as mafic xenoliths within ductile shear zones, and underwent multipile deformations. To the south, the Hengshan-Chengde HPGB is juxtaposed with the Wutai greenstone belt by several strike-slip shear zones. Preliminary isotopic age dating indicates that HPGs from North China were mainly generated at the end of the Neoarchaean, assocaited with tectonic assembly of the western and eastern blocks.
基金The research of G.Bao,Y.Wang,and Z.Xu was supported in part by the NSF CMG grant EAR-0724527NSF grant EAR-0724656 to T.Ehlers and P.Li.
文摘Thermochronometer data offer a powerful tool for quantifying a wide range of geologic processes,such as the deformation and erosion of mountain ranges,topographic evolution,and hydrocarbon maturation.With increasing interest to quantify a wider range of complicated geologic processes,more sophisticated techniques are needed.This paper is concerned with an inverse problem method for interpreting the thermochronometer data quantitatively.Two novel models are proposed to simulate the crustal thermal fields and paleo mountain topography as a function of tectonic and surface processes.One is a heat transport model that describes the change of temperature of rocks;while the other is surface process model which explains the change of mountain topography.New computational algorithms are presented for solving the inverse problem of the coupled system of these two models.The model successfully provides a new tool for reconstructing the kinematic and the topographic history of mountains.
