granites

The identification of the Early Caledonian granites is of important significance in studying the geological tectonic evolution of the area.

早古生代花岗岩的确认对该区地质构造演化研究具有重要意义。

By calculating the calc-alkali index (CA) and alumina saturation index (ASI), the magma types of the granites can be roughly determined.

通过钙碱指数（CA）和铝饱和指数（ASI）的计算，可以大体获知花岗岩的岩浆类型。

Zircon U-Pb ages, geochemistry and its petrogenesis of Jurassic granites in northeastern part of the Da Hinggan Mts.

大兴安岭东北部侏罗纪花岗质岩石的锆石U-Pb年龄、地球化学特征及成因。

Most ore-bearing granites in Yanshan region are located in Yanshan zone of subsidence, which appear in the form of stocks.

燕山地区含矿花岗岩大多数分布于燕山沉降带，并以小岩株产出。

Recent studies show, however, that rapakivi granites can be formed in age from Archaean to Phanerozoic and can even occur in orogen.

环斑花岗岩既可以出现于从太古代到显生宙的各个地质时期，也可以产生于造山带中。

The Huangshan A-type granites with tetrad REE: constraints on Mesozoic lithospheric thinning of the southeastern Yangtze craton?

高度演化的黄山A型花岗岩：对扬子克拉通东南部中生代岩石圈减薄的约束？。

The weathered granites exposed in southeast China play unique roles in geotechnical engineering and environmental preservation.

华南花岗岩风化壳与人类生存发展关系密切，在工程建设与环境保护方面尤为突出。

Both low temperature and rapid exhumation are believed to be the major reason for lack of both syncollisional and postcollisional granites .

低温、快速折返是缺乏同碰撞和碰撞后花岗岩类的主要原因。

However, ages of granites decrease from the southwest to the northeast. These granites have similar geochemical characters.

但从西南往东北方向，形成时代有逐渐变年轻的趋势。

In the granites and related rocks the alkalis are, of course, noticeably in excess of the femic constituents .

在花岗岩及有关的岩石中，碱质当然显著地超过铁镁组分。

Widespread in the four provinces of Southeast China are U-rich granites , with a high-radon background.

我国东南四省广泛分布着大量的富铀花岗岩，是氡的高本底区。

Mineralogical and geochemical features suggest that the Dadongshan granites are highly fractionated I-type granites.

矿物学及地球化学结果表明大东山是一个高分异的I型花岗岩岩体。

The voluminous alkaline granites in the region were probably from the same magma source, but crystallized at upper crust depth.

该地区体积巨大的碱性花岗岩可能也来自相同的岩浆源，只不过它是在较浅的地壳深度上结晶的。

Several zones of granites with low Nd model ages have been found in southeastern China.

发现华南有若干低钕模式年龄花岗岩带。

The parent rocks in the source areas are mainly composed of low-to medium-grade metamorphic rocks and granites.

主物源区母岩性质以变质岩为主，母岩岩石类型为由低-中级变质岩和花岗岩。

The granites of syntectic type (I-type) and metamorphic-mixed metasomatic type are associated only with uranium occurrences.

变质混合交代型和同熔型（I型）花岗岩只有铀矿点或矿化点产出。

Unfortunately, there were different cognition about the era and petrogenesis of Raohe granites by now.

然而关于本区花岗岩的形成时代及成因等方面的问题至今仍存在有不同的认识。

Crushing of granites; mining of coal, minerals embedded in siliceous rocks.

花岗岩粉碎，采煤，硅酸盐矿石内植入矿物。

there some biotite granites belong to the transitional granite between I-and S-type.

同时有一些黑云母花岗岩属于I型和S型之间的过渡类型。

Because of this belt of the Mesozoic granites of the groundwater of the jointed rock cracks, water-spring .

因这一带系中生代花岗岩，地下水附存于岩体的节理裂缝之中，积水成泉。