Several blueschist outcrops, specially glaucophane-bearing ones, were found in Dexing, eastern Jiangnan belt. The latest researches suggest that the blueschists distributed in the Late Proterozoic ophiolite melange bl...Several blueschist outcrops, specially glaucophane-bearing ones, were found in Dexing, eastern Jiangnan belt. The latest researches suggest that the blueschists distributed in the Late Proterozoic ophiolite melange blocks of the northeastern Jiangxi fault zone between the Jiuling tectonic region and the Huaiyu tectonic region of volcanic are that is located near the frontier of Jiangxi, Zhejiang and Anhui provinces (Fig. 1).展开更多
The petrology and mineral assemblages of blueschists in the Gangmar, central Qiangtang, northern Tibet were examined, which indicates that the metamorphic condition is high-pressure low-temperature. In this note, we r...The petrology and mineral assemblages of blueschists in the Gangmar, central Qiangtang, northern Tibet were examined, which indicates that the metamorphic condition is high-pressure low-temperature. In this note, we reported the 40Ar/39Ar dating results of glaucophane from two blueschist samples. Their apparent ages are (275.0±1.3) Ma and (287.6±2.3) Ma and similar isochron ages are (275.0±0.9) Ma and (282.4±0.8) Ma, respectively. These iso-topic datings show the high-pressure metamorphism occurring in Lower Permian. The ages also coincide with the evolution of Palaeo-Tethys ocean in Late Palaeozoic.展开更多
Glaucophane in Shuangjiang area, West Yunnan Province, supplies a chance for studying south segment of Lancangjiang tectonic zone. But people are at odds as to whether two stage glaucophane exists or not, glaucophane...Glaucophane in Shuangjiang area, West Yunnan Province, supplies a chance for studying south segment of Lancangjiang tectonic zone. But people are at odds as to whether two stage glaucophane exists or not, glaucophane is the result of dynamic metamorphism later, or indicates a high P/T metamorphic belt when Paleozoic Tethys Sea closed. Authors discover in a recent research that there is only one stage glaucophane in Shuangjiang area, and three blueschist belts are distributed near N S tending, and glaucophane in Shuangjiang area is related to the eastward subduction of Changning Menglian basin.展开更多
基金Project supported by the National Natural Science Foundation of Chinathe "Laboratoire de Géologie Structurale" of Orleans Université, France
文摘Several blueschist outcrops, specially glaucophane-bearing ones, were found in Dexing, eastern Jiangnan belt. The latest researches suggest that the blueschists distributed in the Late Proterozoic ophiolite melange blocks of the northeastern Jiangxi fault zone between the Jiuling tectonic region and the Huaiyu tectonic region of volcanic are that is located near the frontier of Jiangxi, Zhejiang and Anhui provinces (Fig. 1).
基金the National Key Basic Research Project (Grant No. G1998040800) the CAS's Key Basic Research Project for the Tibetan Plateau (Grant Nos. KZ951-A1-204 and KZ95T-06).
文摘The petrology and mineral assemblages of blueschists in the Gangmar, central Qiangtang, northern Tibet were examined, which indicates that the metamorphic condition is high-pressure low-temperature. In this note, we reported the 40Ar/39Ar dating results of glaucophane from two blueschist samples. Their apparent ages are (275.0±1.3) Ma and (287.6±2.3) Ma and similar isochron ages are (275.0±0.9) Ma and (282.4±0.8) Ma, respectively. These iso-topic datings show the high-pressure metamorphism occurring in Lower Permian. The ages also coincide with the evolution of Palaeo-Tethys ocean in Late Palaeozoic.
文摘Glaucophane in Shuangjiang area, West Yunnan Province, supplies a chance for studying south segment of Lancangjiang tectonic zone. But people are at odds as to whether two stage glaucophane exists or not, glaucophane is the result of dynamic metamorphism later, or indicates a high P/T metamorphic belt when Paleozoic Tethys Sea closed. Authors discover in a recent research that there is only one stage glaucophane in Shuangjiang area, and three blueschist belts are distributed near N S tending, and glaucophane in Shuangjiang area is related to the eastward subduction of Changning Menglian basin.
