摘要
大地化学背景是一种区域地球化学背景。计算深度为地壳最上部的沉积构造层。根据现有的地质学、地球物理学、地球化学和地理学资料，新疆北部地区的面积８５７０００ｋｍ２，沉积构造层平均厚度为１３．９ｋｍ，其质量为３．１３×１０１６ｔ。在沉积构造层模型和岩石化学资料基础上，计算和研究了新疆北部地区沉积构造层的平均化学成分和元素丰度。大地化学背景比地壳和岩石圈的化学背景具有更高肯定性。其背景值对区域成矿分析和矿产资源总量评价以及环境质量分析和评估等工作，具有更大的实用价值。
The tectonogeochemical background is one of a larger regionality with the uppermost tectonic lager of the earth crust as its calculating thickness. Ba sed on the data from the geological, geophysical, geochemical and geographical s urvey in northern Xinjiang region, its fundamental data are: Area 857000km 2, ave roge thichness 13.9km, mass 3.13×10 16 metric tons. With the model of sed iment tectonic layer and the petrochemical data, the average chemical composition and the abundance of elements in northern Xinjiang sediment tectonic layer are calcu lated and explored. The chemical background values of tectonic structure have a higher certaintry than those of earth crust and lithcsphere. And the tectonogeo chemical backgroung is of greatly practical value to regional metallogenic analy sis and mineral resource appraiscment. The values of the background we dealt fo r some first order geotectonic units in Xinjiang are given in this paper.
出处
《地质科学》
CAS
CSCD
北大核心
1999年第2期177-185,共9页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家305项目
关键词
大地化学背景
沉积构造层
新疆
北部地区
Tectonogeochemical background\ Sediment tectonic la yer\ Northern Xinjiang
