摘要
根据：准噶尔盆地分布最广的上古生界火山碎屑岩系的岩石地球化学成分都证明其形成于大陆边缘的火山岛弧区：准噶尔北部的奥陶系为陆棚台地相碳酸盐岩，志留系中也发现类似的灰岩巨型滑塌体，表明海盆的基底为稳定陆块；东准噶尔发现了１９亿年的古老混合岩：晚古生代至中新生代盆地一直处于陆盆发育阶段，因而得出结论，准噶尔地区早古生代为大陆地壳而非大洋地壳。
It is concluded that Junggar area is a continental crust rather than an oceanic crust during Early Paleozoic. based on the following evidences: geochemical components of the most widely-distributed Upper Paleozoic volcaniclastic in Junggar basin formed in the volcanic island arc area of continental margin; the Ordovician in the northern Junggar area is composed of continental shelf platform carbonate, and similar limestone decollement was discovered in the Silurian, indicating that the basement of ocean basin is a stable continental block: composite rocks (1900Ma) were found in the eastern Junggar area; the basin is at the stage of continentul basin evolution during the Late Paleozoic to Middle Cenozoic.
出处
《新疆石油地质》
CAS
CSCD
北大核心
1994年第4期289-297,共9页
Xinjiang Petroleum Geology
关键词
准噶尔盆地
早古生代
陆壳
Junggar basin Early Paleozoic Continental crust
