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钙长岩

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The main components of the Yonghe--Taibao granitic pluton are calc-alkali quartz diorite and monzonite.

永和太保花岗岩体主要为钙碱性石英闪长岩和二长花岗岩。

The orebody is located in a contacting belt between granodiorite of Mesozonic and calcareous-aluminous rocks of Peleozoic,and controled by structure and nature of the rocks.

矿床产于中生代花岗闪长岩和古生代钙铝质岩石的接触带中,矿体受构造和岩性控制。

The garnets in the granitic gneisses from southern Dabie mountain were characterized by riching in Fe and Mn, and pooring in Mg, differing from the garnets in the UHP gneiss and eclogite, which relatively riching Mg. But the plagioclase in the granitic gneisses from the northern Dabie mountain was relative high Ca contenents, their An is 25.2-27.9, within the oligoclase field.

石榴石总体以贫Mg富Fe和富Mn为特征,明显不同于榴辉岩及高压片麻岩中石榴石相对富Mg的情况;而北大别英云闪长质片麻岩中斜长石的钙含量相对较高,An为25.2-27.9,位于奥长石范围内,角闪石中Mg的含量较高,具有壳幔混合源的特征。

Volcanic rocks are of the high-K calc-alkaline series rock association, composed mainly of ryholitic and trachytic dacitic rocks, and the central intrusive body is olivine-andesite-trachytic quartz syenitic porphyrite.

火山岩为以流纹质和粗面英安质为主的高钾钙碱性系列岩石组合,中央侵入体为橄榄安粗岩系列石英正长斑岩,它们的A/CNK值集中在0.9~1.2之间,为铝饱和或铝过饱和类型。

Any of a common rock-forming series of triclinic feldspars, consisting of mixtures of sodium and calcium aluminum silicates.

斜长岩三斜晶长石系列中一种普通的成岩石,由钠和钙铝硅酸盐组成

Any of a common rock - forming series of triclinic feldspar s,consisting of mixtures of sodium and calcium aluminum silicates.

斜长岩三斜晶长石系列中一种普通的成岩石,由钠和钙铝硅酸盐组成

Any of a common rock - forming series of triclinic feldspars,consisting of mixtures of sodium and calcium aluminum silicate s.

斜长岩三斜晶长石系列中一种普通的成岩石,由钠和钙铝硅酸盐组成

The Penshan granitic body is a calc-alkaline pluton composed of muscovite alkali granite, two-mica alkali feldspar granite and biotite adamellite.

彭山岩体是由白云母碱长花岗岩、云母碱长花岗岩和黑云母二长花岗岩组成的钙碱性花岗复式岩体。

The Nurt area is located in the north of Altay, Xinjiang, where the granites are widely exposed. The intrusion is adamellite and belongs to high kalium cal-alkaline series with peraluminous characteristics, showing an osculating relationship with the Aketisikan gold deposit.

新疆诺尔特地区花岗岩分布广泛,其中阿提什花岗岩体与燕山期阿克提什坎金矿床在时间、空间上密切相关,该岩体为二长花岗岩,具铝过饱和特征,属于高钾钙碱性系列。

The Paleoproterozoic Beidahe Group-complex remains as continental shivers in the interior of the North Qilian orogen. In its early stage of development, there occurred abundant amphibolite. The protolith of the amphibolite is basalts. The Alk-∑FeO-MgO plot, REE features and Rittmann index show that the protolith belongs to the calc-alkaline suite and exceptionally shows the subalkaline character. The rock is characterized by higher Al2O3 and ∑FeO and lower Mg#, indicating that it has a higher degree of compositional evolution and that the formation of volcanic rocks is related to activation of older crust. Highly fractionated REE patterns and amphibolite on the Ti-Zr-Y plot, Ni-FeO/MgO plot and Ta/Yb-Th/Yb plot all indicate the characteristics of volcanic arcs and active continental margins. On the geochemical diagram of basalt, the overall REE features are in the main analogous to those of calc-alkaline island-arc basalt, with Sr87/Sr86=0.71617–0.72033,Nd143/Nd144=0.512414–0.512495 and εNd=–2.79 to –4.37,εSr=245.78–305.3, showing that the magma was derived from the crust or subjected to contamination with the lower crust below the continent.

提要:以大陆碎块形式残存于北祁连造山带内部的古元古代北大河岩群早期发育有大量的斜长角闪岩,其原岩为玄武岩,Alk—∑FeO—MgO图解,REE特征,里特曼组合指数等均显示斜长角闪岩属钙碱性系列范围,个别显示弱碱性,斜长角闪岩具有较高的Al2O3,∑FeO和低的Mg#,这些特点反映其成分演化程度较高,表明火山岩的形成与古老地壳的活化有关,有较强分异的稀土元素分配模式,在Ti—Zr—Y图,Ni—FeO/MgO图解和Ta/Yb—Th/Yb图解上斜长角闪岩均显示火山弧或活动大陆边缘的特点,在玄武岩的地球化学形式图,稀土元素整体特征与钙碱性岛弧玄武岩基本相同;87Sr/86Sr=0.716 17~0.720 33, 143Nd/144Nd=0.512 414~0.512 495,εNd=-2.79~-4.37。

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