| 龙首山古裂谷带及河西走廊的大地构造 |
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| TECTONICS OF THE LONGSHOUSHAN ANCIENT RIFT AND HEXI CORRIDOR |
| On the basis of recent investigations in Gansu Province and tectono-Stratigraphical analysis the authors consider that there is a Proterozoic rift of WNW trend along the Longshoushan Mountains on the southern margin of the Alxa massif. The Dunzigou Group and Hanmushan Group of closed lagoon facies or neritic facies were deposited in the rift during the Middle-Late Proterozoic. Along the rift a series of ultramafic-mafic intrusions conlainning Ni-Cu ore deposits are scattered in the area of Jinchuang. The whole Hexi Corridor of Gansu Province may be divided into two halves. The eastern half is an orogenic zone along the southern continental margin of the Alxa massif and consists of the Yongchang-Wuwei miogeocline and the Lenglongling-Gulang eugeocline from north to south. In the Early Paleozoic, it belonged to the North China-Korea Paleoplate. The western half is a part of the northern Qilian eugeocline and belonged to the Qaidam-Qilian paleoplate in the Early Paleozoic. The suture line between the two halves lies from Gaotai to Minle. Through the authors' repeated investigations, the tectonic evolution of the Qilian Mts, and Hexi Corridor between the two paleoplates has been established. At least seven tectonostratigraphic terranes can be recongnized in this region. Among them, the northermost one occurs on the southwestern margin of the North China-Korea Paleoplate, and the other six terranes occur on the northern-continental margin of the Qaidam massif. |
| LIU Xue-ya,WANG Quan.1993.TECTONICS OF THE LONGSHOUSHAN ANCIENT RIFT AND HEXI CORRIDOR[J].Acta Geoscientica Sinica,14(2):1-14. |
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