paleo-tethys ocean 中文意思是什麼
paleo-tethys ocean
解釋
古地中海-
Thus, it can be clearly recognized that the global continents located at near equator and southern hemisphere, showed the characteristics of range along latitude ; chinese continental blocks still located among the laurentia, siberia and gondwana in paleozoic ; following the fast moving of siberia plate to northwards, the amalgamation in north - south direction at the western parts of laurentia and gondwana, subducted the lapetus and rheic oceans, until to form the uniform pangea in the late stage of paleozoic ; however australia and india plates in eastern gondwana move and disperse gradually to southwards, to extend crust and form the paleo - tethys ocean ; the chinese continental blocks and adjacent blocks still located in paleo - tethys ocean, preserved the status of dispersion, gradually moving to northwards, showed the characteristics of range along north - south orientation, until carboniferous and triassic a series of local collisions happened in tianshan - hing ' anling, kunlun, qinling - dabie, jingshajiang and shaoxing - shiwandashan zones, thus the most part of chinese continental blocks amalgamated to eurasia continent
由此可以清晰地看出，在古生代早期全球各大陸的主要部分都位於赤道附近及南半球，大致表現為沿緯度、呈東西向排列的特徵，中國及鄰區的小陸塊群在古生代始終都處在勞倫大陸、西伯利亞與岡瓦納大陸之間；隨著西伯利亞大陸的快速北移，在勞倫大陸與岡瓦納大陸的西部地區發生南北向拼合，亞皮特斯洋和里克洋的消亡，到古生代晚期形成統一的泛大陸；而岡瓦納大陸的東部（澳大利亞和印度等）則逐漸向南移動、離散，地殼張開，構成古特提斯洋；中國及鄰區的小陸塊群則一直處在古特提斯洋中，保持離散狀態，總體上緩慢地向北運移，並逐漸轉為近南北向的排列方式，石炭紀到三疊紀才在天山興安嶺、昆侖山、秦嶺大別、金沙江和紹興十萬大山等地段發生一系列局部性的陸陸碰撞，使中國大陸地塊的大部分逐漸併入歐亞大陸。 -
Thus, they might be derived from a back - arc basin with an archipelagic system in paleo - tethys, instead of a large ocean basin. the isotopic geochemistry shows that the jinshajiang ophiolitic melange has higher e nd ( t ) values ( + 7. 42 - + 5. 44 ), suggesting that it may be derived from a lree depleted mantle source without significant contamination by the continental crust, but affected slightly by a fluid from a subducted ocean crust
同位素地球化學研究表明，金沙江蛇綠混雜巖具有較高的_ （ nd ） （ t ）值（ + 7 . 42 + 5 . 44 ）暗示蛇綠巖來源於lree長期較虧損的地幔源，演化過程中沒有受到陸源物質的明顯混染，而主要受到少量俯沖洋殼析出流體的影響。
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