释光测年中细颗粒石英Stokes沉降法及敏感度意义  

Luminescence Dating and Sensitivity Significance of Quartz Stokes Sedimentation

作　　者：李娇 Li Jiao(Department of Geology,Northwest University,Xi’an 710069,China)

机构地区：[1]西北大学地质学系,西安710069

出　　处：《中国资源综合利用》2020年第3期55-57,共3页China Resources Comprehensive Utilization

摘　　要：中国黄土高原在世界上分布最为广泛,黄土连续不间断,厚度大。洛川剖面位于黄土高原中部,地层序列完整,出露良好,古气候信息记录全面。石英释光敏感度是示踪黄土物源的指标之一。小于20μm的细粒组分可以在空中悬浮较长的时间,降低了来自近源较粗的颗粒对黄土物源分析的影响,其石英释光敏感度可以指示黄土高原物质来源。本文对中国黄土高原洛川剖面进行研究,探讨4~11μm细颗粒石英在释光测年浮选方法中的一些问题及其释光敏感度意义。The Loess Plateau in China is the most widely distributed in the world,the loess is continuous and uninterrupted,with a large thickness.The Luochuan profile is located in the middle of the Loess Plateau,the stratigraphic sequence is complete and the exposure is good,the paleoclimate information records are comprehensive,quartz luminous sensitivity is one of the indicators for tracing loess provenance.The fine-grained components smaller than 20μm can be suspended in the air for a long time,which reduces the influence of coarser particles from near sources on the analysis of loess provenance,and its quartz luminescence sensitivity can indicate the loess plateau source.This paper studies the Luochuan section of the Loess Plateau in China,and discusses some issues of 4~11μm fine-grained quartz in luminescence dating flotation methods and their significance of luminescence sensitivity.

关 键 词：黄土高原 物源 释光敏感度 细颗粒 

分 类 号：P597.3[天文地球—地球化学]