基于地质异常的内蒙古新达来草原覆盖区钼铜多金属矿产定量预测

内蒙古新达来草原覆盖区位于古亚洲成矿域的二连—东乌旗钼铜多金属成矿带西段,分布有乌兰德勒、准苏吉花等与中酸性侵入体有关的内生金属矿床,成矿地质条件优越.然而,因受牧草和第四系大面积覆盖的影响,该区各种成矿/示矿信息具有间接、叠加、隐蔽、微弱、不完整等特点,给找矿勘查带来更大的不确定性和风险.因此,必须加强矿产定量预测研...     

STARFIRETM-RTG星基差分实时精密单点定位原理、测试与应用

STARFIRE^TM-RTG（Real Time GIPSY实时GIPSY）是美国NaVCom公司在WCT（Wide—Area Correction Translorm）基础上,应用JPL的实时修正算法和GIPSY软件,建立的全球差分定位服务系统。可适应各种环境,无需基准站,无需地面通讯数据链,并具有多种模式和特有的用途。以美国NAVCOM公司生产的目前全球唯一的STARFIRE^TM2050G与2040G型RTG接收机的原理、性能和广州测试情况以及本公司对其应用范围的可行性进行介绍和讨论。     

川西甲基卡地区侏倭组沉积物源分析——来自碎屑锆石U-Pb年龄证据

松潘-甘孜造山带是青藏高原东北部的重要组成单元,是华北板块、扬子板块和羌塘块体的主要汇聚地区,主要由中生代浅变质沉积地层和一系列岩浆岩组成,记录了印支期以来块体之间的收敛汇聚等构造活动。其中,雅江残余盆地发育一套厚度巨大的中生代碎屑岩和岩浆岩地层组合,是研究松潘-甘孜造山带地质构造演化的理想地区之一。本文对川西甲基卡地区侏倭组的样品进行了碎屑锆石LA-ICP-MS U-Pb年龄测试,碎屑锆石U-Pb年龄存在四个峰值,分别为231～281Ma、424～502Ma、707～983Ma、1539～1850Ma,表明扬子克拉通西缘及松潘甘孜造山带南部至少经历了四期强烈的构造—岩浆热事件,这四期事件在三叠系沉积地层中有非常清楚的记录。231～281Ma的锆石来自东昆仑,这一年龄段的锆石最可能来自北部晚二叠世松潘洋向北俯冲于华北板块之下所形成的东昆仑岛弧花岗岩。424～502Ma的锆石来自北秦岭,代表了加里东期南秦岭与北秦岭和华北板块的拼合事件。722～983Ma的锆石来自扬子板块,这一年龄段的锆石最可能来自盆地东部新元古界拉伸系上扬子克拉通盆地向北西俯冲于华北板块之下所形成的南秦岭花岗岩,形成于...     

Land use intensity dynamics in the Andhikhola watershed,middle hill of Nepal

Land use intensity is a valuable concept to understand integrated land use system, which is unlike the traditional approach of analysis that often examines one or a few aspects of land use disregarding multidimensionality of the intensification process in the complex land system. Land use intensity is based on an integrative conceptual framework focusing on both inputs to and outputs from the land. Geographers' non-stationary data-analysis technique is very suitable for most of the spatial data analysis. Our study was carried out in the northeast part of the Andhikhola watershed lying in the Middle Hills of Nepal, where over the last two decades, heavy loss of labor due to outmigration of rural farmers and increasing urbanization in the relatively easy accessible lowland areas has caused agricultural land abandonment. Our intention in this study was to ascertain factors of spatial pattern of intensity dynamism between human and nature relationships in the integrated traditional agricultural system. High resolution aerial photo and multispectral satellite image were used to derive data on land use and land cover. In addition, field verification, information collected from the field and census report were other data sources. Explanatory variables were derived from those digital and analogue data. Ordinary Least Square(OLS) technique was used for filtering of the variables. Geographically Weighted Regression(GWR) model was used to identify major determining factors of land use intensity dynamics. Moran's I technique was used for model validation. GWR model was executed to identify the strength of explanatory variables explaining change of land use intensity. Accordingly, 10 variables were identified having the greatest strength to explain land use intensity change in the study area, of which physical variables such as slope gradient, temperature and solar radiation revealed the highest strength followed by variables of accessibility and natural resource. Depopulation in recent decades has been a major driver of land use intensity change but spatial variability of land use intensity was highly controlled by physical suitability, accessibility and availability of natural resources.     

Simulation and Improvements of Oceanic Circulation and Sea Ice by the Coupled Climate System Model FGOALS-f3-L

This study documents simulated oceanic circulations and sea ice by the coupled climate system model FGOALS-f3-L developed at the State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics, Chinese Academy of Sciences, under historical forcing from phase 6 of the Coupled Model Intercomparison Project(CMIP6). FGOALS-f3-L reproduces the fundamental features of global oceanic circulations, such as sea surface temperature(SST), ...     

CAS-FGOALS Datasets for the Two Interglacial Epochs of the Holocene and the Last Interglacial in PMIP4

Two versions of the Chinese Academy of Sciences Flexible Global Ocean–Atmosphere–Land System model(CASFGOALS), version f3-L and g3, are used to simulate the two interglacial epochs of the mid-Holocene and the Last Interglacial in phase 4 of the Paleoclimate Modelling Intercomparison Project(PMIP4), which aims to study the impact of changes in orbital parameters on the Earth’s climate. Following the PMIP4 experimental protocols, four simulations for the mid-Holocene and two simulations for the La...     

时间域航空电磁激发极化参数三维反演研究

时间域航空电磁中心回线(或重叠回线)装置晚期道数据受激电效应影响常出现符号反转现象.这类数据与多个激电参数相关,并且各参数之间灵敏度差异较大,导致反演存在严重的非唯一性.本文提出一种基于Pearson相关性约束和深度学习算法相结合的时间域航空电磁激发极化参数反演策略.该反演策略首先基于深度学习预测时间域航空电磁激电参数,进而给时间常数和频率相关系数一个较小的约束范围后再反演电阻率和极化率,由此大大减少反演的多解性.针对电阻率和极化率的反演,我们采用统计学中Pearson相关系数构建两种物性参数的相关性约束,进一步减少反演多解性.为验证反演策略的有效性,我们对双棱柱模型和拱形模型分别进行反演试算.理论测试结果表明,基于Pearson相关性约束的电阻率和极化率的反演结果比传统的高斯-牛顿反演结果更接近真实模型,而基于深度学习预测时间常数和频率相关系数后的电阻率和极化率反演结果与给定真实时间常数和频率相关系数后的反演结果效果相当.最后,我们对来自澳大利亚的带激电效应的航空电磁实测数据在考虑和不考虑激电效应条件下进行反演,结果表明考虑激电效应的反演无论数据拟合还是地电断面的连续性均得到明显改善.

     

基于层次分析法和模糊评判法的西藏国家气象公园评价研究

本研究依据中国气象局发布的国家气象公园评价指标体系充分考虑高原文化特色,采用层次分析法(AHP)构建了适用于高原的气象公园评价体系。结果表明：在准则层中,天气景观>人文气象景观>环境保护>科学性,权重值分别为45.94%、32.48%、14.91%、6.67%,在因子层中,稀有度>人文价值>气候特征>科学性,权重值依次为25.80%、17.20%、9.70%、5.00%。在此基础上,对纳木措、羊卓雍措、玛旁雍措进行模糊综合评价分析表明,纳木措各因素综合评价为优,羊卓雍措各因素综合评价为良,玛旁雍措各因素综合评价为良。因此,在经济条件有限的基础上,认为纳木措建设成为国家气象公园是最优选择。本研究结果可为环境规划等相关部门和行业提供决策参考。     

2008年度地质学科项目受理与资助分析

2008年度地质学科共受理各类项目1219项。其中面上项目694项,青年科学基金293项,地区科学基金21项,重点项目73项,国家杰出青年基金57项,海外青年学者合作基金3项,创新研究群体2项,重大研究计划项目20项,重大国际合作项目3项,联合资助基金项目25项。1面上项目、青年科学基金和地     

浅谈西南岩溶山地的水文生态效应研究

生态水文学是以土壤为联系纽带的生态学和水文学的交叉学科。本文总结了20 世纪90 年代以来生态水文学和西南岩溶山地生态水文学理论研究和实践方面的进展、存在的薄弱环节, 在此基础上, 论述了岩溶山地生态水文研究的基本内容和原则, 提出应加强岩溶山地生态格局和过程的水文学机制研究。本文旨在引起有关人员对岩溶山地生态水文过程研究的重视。