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英云闪长岩

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Apart from the amphibolite enclaves and dyke swarms, the isotopic ages of the magmatic intrusions have been measured. The magmatic sequence and geochronologic framework are as follows: Quartz monzonite, 1825 ± 23 Ma, TDM = 2920Ma; Throndhjemite, 2374 ± 10 Ma, TDM = 3460 Ma; Tonalite, 2604±102 Ma, TDM = 3063 Ma; Monzonite, 3096±17 Ma, TDM = 2978 Ma; Granite, 3605±43 Ma, TDM = 3528 Ma.

在野外建立热事件相对序列的基础上,通过单颗粒锆石U-Pb法测年和Sm-Nd同位素示踪研究,初步建立了该区早前寒武纪岩浆活动的年代格架:石英二长岩:1825±23 Ma,TDM=2920 Ma;奥长花岗岩:2374±10 Ma,TDM=3460 Ma;英云闪长岩:2604±102 Ma,TDM=3063 Ma;二长花岗岩:3096±17 Ma,TDM=2978 Ma;花岗岩:3605±43 Ma,TDM=3528 Ma。

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。

The protolith of northern khondalite series in neighbouring region is a suite of flyschoid formation consisting of argillaceous arkose-pelitic feldspathic greywaske with intercalations of pelite, silt as well as carbonate and marl beds. They were deposited on continental margin under relative stable tectonic enviroment.

所有特征表明二者之间不存在有些研究者所认为的不整合接触关系,而是大量奥长花岗质-英云闪长质和一些中基性岩浆顺层侵入到一套沉积和火山-沉积表壳岩中,并一起经受多期复杂的变质和变形作用所成。

The tests with the ideal granite, San Jose tonalite and the troctolite from Sybille quarry have demonstrated that the OIMT concept and numerical method are promising to isotope geothermometry.

通过对假想的封闭花岗岩体系、 San Jose英云闪长岩和Sybille采场橄长岩的实例分析可以看出,模式温度计算有良好的自洽性和应用前景。

There are abundant dark inclusions in the Neopoterozoic tonalite pluton near Mo zitan town, northern Dabie Mountain, which probably contain some information on the early evolution of the crust in this area.

大别山北部磨子潭附近新元古代英云闪长岩内包裹有许多暗色包体,其中可能保存有该区地壳早期演化的一些信息。

Honghuapu intrusions in the west segment of Northern Qinling Mountains are dominated by tonalite with medium-fine-granular structure, which carry the geochemic characteristics of subduction-related granitic rocks.

北秦岭造山带西段红花铺侵入体的岩石类型为中细粒英云闪长岩,具俯冲型花岗岩类的地球化学特征。

Neoproterozoic Baoxing Complex in middle to lower metamorphic grade, located in western margin of Yangtze Craton, consists mainly of metamorphic gabbroic, dioritic gneisses, tonalitic and granodioritic gneisses, and massive monzogranites The studies of petrochemistry and SmNd isotopes of Baoxing Complex reveal that the gabbroic and dioritic magmas came from a congenetic magma derived from the partial melting of spinel lherzolites in depletive mantle, and that the magma was intensively contaminated by crustal materials during its emplacement The tonalitic and granodioritic magma were derived from the partial melting of metamorphic basalts in the lower crust And the monzogranitic magma was formed from partial melting of metagreywacks Integrating the lithological association, their trace elements, SmNd isotopic characteristics and petrogenesis, the Baoxing Complex must likely have been emplaced in an island arc tectonic background at the Neoproterozoic active continental margin of Yangtze Craton

位于扬子克拉通西缘的新元古代宝兴杂岩主要由中低级变质的辉长质片麻岩、闪长质片麻岩、英云闪长质到花岗闪长质片麻岩和块状二长花岗岩组成。岩石地球化学和SmNd同位素特征表明,辉长质片麻岩和闪长质片麻岩为同源岩浆演化序列,原始岩浆起源于亏损地幔尖晶石橄榄岩的部分熔融,在上升和侵位过程中受到了地壳岩石强烈混染。英云闪长质和花岗闪长质岩浆形成于下地壳玄武质岩石部分熔融,而二长花岗质岩浆形成于杂砂岩的部分熔融。综合分析宝兴杂岩的岩石组合、微量元素和同位素特征,该杂岩体最有可能形成于新元古代活动大陆边缘火山弧构造背景,并可能经历了碰撞过程。

Accompanying the Jungar plate subdueted dewnwards along the northwest edge of Siberian eraton, the volatile-rich felsie biotite diorite batholiths and a lot of fracture-controlled quartz diorite vein intruded the are-back basin, Au preferently distributed within the disseminated magmatic sulfide during granitoid melt crystallization

阶段Ⅰ。华力西晚期伴随着准噶尔板块向北部西伯利亚板块的强烈俯冲,在额尔齐斯弧后盆地形成偏中性富含挥发份深源黑云英闪侵入岩及大量明显受构造控制的石英闪长岩脉,Au在岩浆结晶-分异演化过程优先在花岗岩中呈浸染状分布的岩浆碱化物中相对富集

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