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Age division of Nanling granites are discussed in relation to geological,stratigraphical,age and other data,The author believes that in Nanling region there exist granites of Xuefeng,Caledonian,Hercynian,Indosinian and Yenshanian ages.Five intrusive stages can be reeognized within the Yenshanian period.The granite belts of Qitianling-Jiufeng and Dadongshan-Guidong,whose ages have been in lively debate for a long time,can be considered as composite belts consisting of multistage emplacement. 相似文献
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笔者对华南花岗岩的部分岩体曾研究过各期次侵入关系的数学分析,所采用的方法是运用铀钍回归系数的统计推断法确定两个岩体的侵入关系。本文是运用这种数学分析方法对苏州地区各期次花岗岩之间判断其是否属于同期活动的产物,并进一步判断溧阳地区庙西花岗岩体与白鹅山花岗岩体之 相似文献
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顾名思义,自然污染是指由于自然因素造成的一种环境污染现象,人们如果处理不当,或者掉以轻心,将导致对环境的人为污染。放射性自然污染是指特殊的地质条件使一些地区岩石的天然放射性元素铀、钍等大量富集,污染水体,甚至超越放射性卫生防护基本标准,影响人们的生活用水。江苏宁镇地区指的是本简报所关注的区域环 相似文献
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本文介绍了一种具有现场测定铀镭平衡系数（Ｋｐ）功能的伽玛能谱仪。该仪器消除了普通γ谱仪给出的异常值偏高或偏低的缺陷。经在二连盆地可地浸砂岩型铀矿床上的试验,表明其对深部铀成矿沉积地质环境的研究和铀矿定位具有实用价值。 相似文献
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The nomenclature of intermediate and acid volcanic rocks presently used is based principally upon mineral association and the correlation between bulk chemistry and mineral assemblages has not received the attention it deserves. On the basis of well documented petrochemical data available on these roeks all over the world, the theoretical background is developed for a quantitative mincroehemieal classification of intermediate and acid volcanic rocks and its validity and advantages are evaluated. The proposed classification scheme is claimed to be helpful to throwing some light into the common features of these rocks and the relationships and gradations between the various representing members. 相似文献
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查瓦里茨基法的数字特征是属于使用与矿物含量没有直接关系的一类参数,尼格里法则是属于较早用化学上的阳离子数量来表示分子标准矿物的一种方法。现代的岩石化学研究方法几乎都趋向于标准矿物法,使化学元素的归纳组合尽可能地与矿物成分结合起来。所以,白文吉提出把查氏数字特征与定量矿物 相似文献
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作者将系统分析的概念引入矿床地球化学的研究过程，从众多的常量组分中筛选出6个评价因子，并依一定的原则确定相应的权分配系数，给出了有效评价参数表达式，从模糊集合分类的角度设计了10个不同矿化类型岩体的矿化隶属度预测模型。 相似文献
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(1) Field observation and age frequcnee spectra indicate that Mesozoic granitesin the Nanling region arc of non-orogenic origin and must be divided in aecordance with stratigraphic timescale rather than with geotectonic cycles. (2) Isotopic ages indicate that some batholiths in the axial part of Caledoniar belts belong to Mesozoic granites. However, field observation and laboratory studies show that they were primarily formed during the early Paleozoic era and have been subjected to alteration of various degrees. (3) With regard to intrusions which isotopic ages are older than that defined by stratigraphic evidences, isotopic measurements will provide the true age of formation of the massivea while stratigraphic evidence should be taken as reflection of local regeneration. 相似文献
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