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中越交界区
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Recent discoveries on ophiolites indicate that there must have been a Paleotethyan geosuture zone bordering China and Vietnam, which separated the Vietbac Block from the Huanan Subcontinent. The Indosinian foreland fold and thrust belt bordering Yunnan and Guangxi supported further evidence to the Paleotethysides. This paper aims at to discuss the main features of thrust nappe structures, and reveal some characteristics of Indosinides in the area which was reformed in the Himalayan orogenesis. The continental...

Recent discoveries on ophiolites indicate that there must have been a Paleotethyan geosuture zone bordering China and Vietnam, which separated the Vietbac Block from the Huanan Subcontinent. The Indosinian foreland fold and thrust belt bordering Yunnan and Guangxi supported further evidence to the Paleotethysides. This paper aims at to discuss the main features of thrust nappe structures, and reveal some characteristics of Indosinides in the area which was reformed in the Himalayan orogenesis. The continental margin of Paleotethyan ocean there may have been a complicated one. The passive continental margin might be NEE striking in southeast Yunnan, with some NW striking troughs (or aulacogens) stretching into the carbonate platform; while in west Guangxi the passive one NW stretching. In southeast Yunnan, the face to face continental collision occurred along the NEE striking segment, and the thrusts constituted a leading imbricate fan; and dextral strike slipping along the NW striking faults. Two kinds of front can be distinguished: a broad and low strained front and passive roof duplex, the latter being related to dextral strike slipping of Wenshan Malipo fault. The manifestation of NW striking thrusts in west Guangxi was dextrally oblique thrusting in Indosinian orogenesis. In addition to thrusts, the nappe structures well occurred in the area. The distant allochthonous rocks are composed of limestones of oceanic island, floating on the Triassic turbidites, and some of them have been involved into the foreland thrusting. The sedimento igneous rocks deposited on passive continental margin in nappe outlier may represent a short distance allochthon, for example, the Funing nappe outlier. The thrusting was extended towards the north or northeast, and the overthrust accretional complex might bury most of the molasse deposits and create a false impression of few molasse occurring.

最近发现的蛇绿岩指示中、越交界区发育一条古特提斯的地缝合线 ,分开了越北地块和华南次大陆。滇桂交界处的印支期前陆褶皱冲断带为古特提斯造山带提供了进一步的证据。本文讨论了冲断 -推覆构造的特征 ,提出该地的古特提斯洋具复杂的大陆边缘 ,沿北西走向段先发生碰撞 ,之后沿北东东向段发生碰撞 ,北西向断裂则发生右行的走滑 (或右行斜冲 )活动。冲断作用是向北或北东扩展的 ,仰冲的增生杂岩可能掩埋了大部分磨拉石沉积 ,造成了磨拉石不发育的假象。

There are three lithostratigraphic units of Permian-Triassic strata in Pingxiang area with varied formational settings:1)plateform-type sediments aging from Carboniferous to Early Triassic,which may comprehend an accreted submarine plateau in the Paleotethyan ocean;2)the Luolou Group,the Baifeng and Hekou Formations aging of Early-Middle Triassic consisting of volcaniclastic trubidites sandwiched with intermediate-acidic lavas,standing for an active continental margin;and 3)the Lower Permian strata of deep-marine...

There are three lithostratigraphic units of Permian-Triassic strata in Pingxiang area with varied formational settings:1)plateform-type sediments aging from Carboniferous to Early Triassic,which may comprehend an accreted submarine plateau in the Paleotethyan ocean;2)the Luolou Group,the Baifeng and Hekou Formations aging of Early-Middle Triassic consisting of volcaniclastic trubidites sandwiched with intermediate-acidic lavas,standing for an active continental margin;and 3)the Lower Permian strata of deep-marine facies,associated with intermediate-basaltic lava and ultramafic rocks,being survived in a nappe-outlier thrust onto the former two units.The petro-chemical features indicate that the volcanic lava was low-potassium tholeiite,erupted in a tectonic setting of island-arc which might be situated in north Vietnam originally.The basalts along Yangxü-Badu represented a passive continental margin in Early Permian.Both the island-arc and passive continental margin might have migrated towards the northeast during Early-Middle Triassic.Namely,the Indosinides bordering China and Vietnam should be a Turkic-type orogen.

广西凭祥地区有 3种不同建造背景的二叠三叠系。深水相的下二叠统呈一飞来峰推覆在台地型的石炭纪早三叠世沉积和早中三叠世浊积岩上 ,与前者共生的基性 -超基性岩是古特提斯岩浆弧的记录 ,当时的被动大陆边缘在百色阳圩田林八渡 ,说明洋壳向南西消减 ,早二叠世弧的原形成位置可能在越南境内 ,早 -中三叠世的弧则已向北东迁移 ,在中越交界区形成图尔基式造山带。

 
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