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流纹英安岩

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The rock types include rhyolite,dacite and sedimentary volcaniclastic rocks,among which the lava tuff breccia was newly discovered in the 1∶ 50 000 region.

岩石类型为流纹岩、英安岩和沉火山碎屑岩,其中的熔结角砾凝灰岩是本次 1∶ 5万区调中的新发现。

The research results indicate that the volcanic rocks in the studied abea are composed of two different kinds of association: Tholeiitic series and calc-alkaline series (basalt, andenite, dacite and rhyolite ).

结果表明,研究区火山岩由拉斑系列大洋玄武岩和钙碱性系列岛弧玄武岩、玄武安山岩、安山岩、英安岩和流纹岩组成。

Firstly, the volcanics and shaly sand were separated with FMI static images and conventional logging data. Then, the image characteristics of all typical volcanics were analyzed with the dynamic FMI images to establish the FMI image patterns of volcanic lava (including rhyolite, dacite, andesite, and basalt) and volcaniclastic rock (including volcanic breeds and tuff).

首先利用FMI静态图像和常规测井曲线将砂泥岩与火山岩区分开来;然后利用FMI动态图像分析了火山岩各种岩性的图像特征,归纳总结出火山熔岩类(流纹岩、英安岩、安山岩、玄武岩)和火山碎屑岩类的FMI图像模式。

Based on plentiful isotopic dating data and geological studies, the authors, in this paper, discuss the geological meanings of the two isotopic ages given by Lapierre et al., and conclude:① Mesozoic volcanic activities in Zhejiang are most frequent in 130~83 Ma, that is, from the early to late Cretaceous but not the late Jurassic;② The Jiande and Moshishan groups are nearly in the same period and not in an upper—lower stratigraphic relationship with each other;③ The period of 110~100 Ma is a transitional stage from the early high-K calc-alkaline dacite—rhyolite associated with diorite—granodiorite) to the late basalt—rhyolite(associated with K-feldspar granite—alkali granite).

本文就Lapierre等文中124 Ma和97 Ma两个年龄的地质意义、幕次划分以及浙西与浙东火山岩时代对比作出评论,并厘定浙江中生代火山岩时代归属,提出:①浙江中生代火山活动时代为132~83 Ma;②浙西建德群与浙东磨石山群火山岩并不存在上下关系,地质接触关系、古生物组合和大量同位素定年数据都不支持Lapierre等的浙西与浙东火山活动幕次的对比方案;③ 110~100 Ma为早期高钾钙碱性英安岩—流纹岩(伴生闪长岩—花岗闪长岩)向晚期玄武岩—流纹岩(伴生钾长花岗岩—碱性花岗岩)过渡的转折期。

The lava includes sub-alkali and alkali series. The former includes picrite-basalt, basalt, basaltic andesite, andesite, dacite and rhylite etc; the latter includes tephrite, trachybasalt, basaltic trachyandesite, trachyandesite, trachyte and pantellerite etc.

其中熔岩类有亚碱性系列和碱性系列,前者包括苦橄玄武岩、玄武岩、玄武安山岩、安山岩、英安岩、流纹岩等,后者有碱玄岩、粗面玄武岩、玄武粗安岩、粗安岩、粗面岩、碱硫岩等。

Early Cretaceous granitic volcanic-intrusive complex in Xiushanlinchang of northeastern Da Hinggan Mt. consists mainly of rhyolite, rhyolite ignimbrite-trachytic dacite, trachyandesite formed in eruptive cycle stage and adamellite porphyry-geode syenogranite-graphic alkali feldspar syenogranite formed in hypabyssal invasion stage.

大兴安岭东北部秀山林场一带的早白垩世花岗质火山-侵入杂岩体由喷发旋回期的流纹岩、流纹质熔结凝灰岩-粗面英安岩、粗安岩和浅成侵入期的二长花岗斑岩-晶洞正长花岗岩-文象碱长正长花岗岩构成。

The Mesozoic volcanic rocks are mainly located in Huoshiling Formation and Yingcheng Formation. The former consists of basaltic andesite, trachyandesite and dacite, the latter is composed of basaltic trachyandesite, trachyandesite and rhyolite. The cathodoluminesence images and high Th/U ratios of the zircons suggest their magmatic origin.

松辽盆地南部中生代含火山岩地层主要包括火石岭组和营城组,其中火石岭组火山岩由玄武安山岩-粗安岩-粗面英安岩组成,营城组火山岩由玄武质粗面安山岩-粗面安山岩-流纹岩组成。

It pointed out that meanwhile,the borders between Ehuling group and Daguding group and underlay-layer,which were invaded by granite porphyry and rhyodacite porphyry,respectively,were two shiole faces of the volcano subside and they comp...

同时,指出了两旋回间及早旋回与基底之间的界面是相山火山塌陷中的两个滑脱面,它们分别被花岗斑岩和流纹英安斑岩所侵位,构成了相山火山塌陷盆地东北部及西北部的半环状构造

The granitic enclaves in the central-facies porphyroblastic lava are subvolcanic rocks with forming age of 134.2±1.9Ma. There is another intrusion of subvolcanic rhyodacitic porphyry with age of 136.0±2.6Ma, in the contact zone of the two volcanic cycles in the western part of the Xiangshan complex. The U-Pb ages of the sub-quartz-monzonite porphyry and lamprophyre are 129.5±2.0Ma and 125.1±3.1Ma, respectively. This suggests that the extension in the Xiangshan region, began in K〓, was week, and earlier than that in the coastal region of Zhejiang and Fujian provinces. Extension in K〓 in Xiangshan and neighboring regions was much stronger, forming NE striking large red-downfaulted-basins.

相山中心相碎斑熔岩中的花岗质包体属次火山岩,其成岩年龄为134.2±1.9Ma,在相山西部两火山旋回的界面之间,存在另一类次火山岩的侵位,其成岩年龄为136.0±2.6Ma,岩性为次流纹英安斑岩;次石英二长斑岩及煌斑岩的成岩年龄分别为129.5±2.0Ma及125.1±3.1Ma,说明相山地区的伸展、裂解作用明显早于浙、闽沿海,在K〓就开始了,但规模并不是很大;而K〓时期的拉张作用在相山及其邻区表现的更为强烈,形成了大面积的呈北东向展布的红色断陷盆地。

Petrological and petrochemical characteristics show that there exist such volcanic and subvolcanic rock types as basalt, iddingsite olivine basalt, olivine basaltic trachyandesite, trachybasalt, latite, trachydacite, trachyte, rhyolite, tuff and granite-porphyry in northeast Jiangxi Province. The volcanic rocks can be subdivided into high K calc-alkaline series, shoshonite series and alkaline basalt series.

岩石学及岩石化学特征表明,赣东北地区早白垩世火山岩及次火山岩主要有:玄武岩、伊丁石化橄榄玄武岩、橄榄玄武粗安岩、粗面玄武岩、安粗岩、粗面英安岩、粗面岩、流纹岩、凝灰岩及花岗斑岩等,可划分为高钾钙碱性、橄榄安粗岩和碱性玄武岩3个系列。

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