摘要
笔者首次将海拔高度的概念及现代冰川理论 ,并结合古地磁资料 ,提出罗圈冰期时古天山 -秦岭山脉是一条大约位于赤道 -北回归线之间、由众多高山组成的 ,且许多山峰至少在 4 0 0 0m以上 ,已形成冰川、或许局部地区存在冰原的山脉 ,总的地理特征类似于今天的喜马拉雅山脉。而华北地块和库鲁克塔格地块是高原或平原 ,此二地块的南边是海域。古秦岭的南坡是现代秦岭的北坡。冰川融化时冰水携带的冰碛物向南流入海 ,所以华北地块上无冰碛物存在大地构造上 ,晋宁期以前 ,上述各地块相互独立。震旦纪时它们开始发生作用 ,秦岭地块和阿克苏—乌什地块分别向华北地块与库鲁克塔格地块汇聚 ,引起后者上升 ,逐渐发展成为山脉。至震旦纪末期 ,山脉上升到 4 0 0 0m以上 ,形成冰川。此后 ,山脉被剥蚀夷平 ,至寒武纪初 ,华北、库鲁克塔格两地块又降到海平面之下接受沉积 ,该山脉消亡。由此我们恢复了新元古代超大陆一条造山带 ,并推测新元古宙末期华北、华南。
Based on paleomagnetism, ancient Qinling-Tianshan range is a mountain range with much of high mountains, during Luoquan glacial stage. They had over 4000m high at sea level. The range located near equator north tropic, and is similar to Himalayas. North China plate was plain and Quruqtagh plate was plateau on geomorphology. The southern was a wide sea. The south mountain slope of ancient Qinling is the north mountain slope of now Qinling. On tectonic, each plate developed by self before Jinning period. During Sinian, they had been collided each other. Qinling plate and Aksu-Wushi plate were underthrusted into north China plate and Quruqtagh plate. Last Sinian, the collision zone had been uplifted into a mountain range, over 4 000 m at sea level. Early cambrian, north China plate and Quruqtagh plate had been downed under the sea level and sedimented. We have reseted an orogenic belt about the neoproterozoic supercontinent.
出处
《前寒武纪研究进展》
2000年第4期238-243,共6页
Progress in Precambrian Research
