秦岭三叠系特提斯型沉积与“开合”演化
“Open-Close” Evolution and Triassic Tethyan-Type Sedimentation in Qinling Orogenic Belt
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摘要: 秦岭三叠系为东-西向带状展布，与南、北两侧的前三叠系以区域性断裂为界。西宽东窄楔形向东尖灭，向西与巴颜喀喇特提斯复理石建造相连，建造类型独特，以深水相重力流、崩塌堆积、滑混堆积、浊流沉积为主，厚度巨大。塑性流变、纵弯褶皱普遍发育，形变程度显著高于与其比邻的前三叠系，具有裂陷槽沉积和演化特征。裂陷槽裂“开”于中三叠世，“合”于中三叠世晚期-晚三叠世早期。秦岭三叠系特提斯型建造显著有别于中国扬子型台地相三叠系建造，记录了一个环境相对独立、应变域特殊、“开-合”演化旋回完整的构造事件。Abstract: The Triassic stratum in Qinling is boundary by regional fault in north and south, with east-westzonal distribution, which is connected with Paleotethys flysch in Bayakala area to the west, with wedgeshape. It is characteristics by great thickness and unique construction, in cluding deep water gravity flow, collapse accumulation, and slippery mixed turbidites. Moreover, the Triassic stratum has plastic flow structure and longitudinal fold, which is stronger than Pre-Triassic stratum in neighborhood area, indicating aulacogen sedimentary and evolution features. The aulacogen was opened in Middle Triassic and closed in late stage of Middle Triassic toearly stage of Late Triassic. The Triassic stratum in Qinling isobvious different from the Yangtze-type platform in China, which recorded a complete"open-close"tectonic event with relatively independent setting and specific strain domain.
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Key words:
- Triassic /
- Tethyan-type sedimentary /
- aulacogen /
- "open-close"evolution /
- Qinling
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