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斑流岩

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Stratum near the bridge foundation is rhyolite porphyry in late Jurassic period. A little of slope eluvium exists on the top of the mountain, which is 200 m long and 80 m wide, and its all sides face to sea. The integrality of rock mass of the mountain is relatively poor because of the effect of some faults and other structural fissures.

桥基所在地层为晚侏罗系流纹斑岩,山体顶部有少量坡残积层,地形上该山体平均长200m、宽80m,四面临空,且受数条小断层及共他构造裂隙的影响,山体岩体完整性较差。

Rhyolites are a group of extrusive igneous rocks with phenocrysts (visible crystals that grew out of the molten lava) of quartz and alkali feldspar in a glassy to cryptocrystalline groundmass.

流纹岩是一组受挤压火成岩矿,包含了在玻璃基的隐晶质中的石英与碱性长石的斑晶(生在于熔岩外的可见石英晶体)。

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。

Petrochemistry, trace element, REE and isotope geochemistry of quartz syenite porphyry, quartz diorite porphyry, rhyolite, and biotite granite indicate that they belong to series Ⅱ granite defined by Wangliankui (l972), but they have some characteristics of series Igranite, which shows adding of recycle upper-crust materials.

岩浆岩岩石化学、微量元素、稀土元素及同位素地球化学特征表明,莲花山矿区的石英正长斑岩、石英闪长玢岩、流纹岩和黑云母花岗岩属于王联魁(1972)所划分的系列Ⅱ花岗岩(相当于Ⅰ型磁铁矿系列花岗岩),但也具有系列Ⅰ花岗岩的某些地球化学特征,表明岩浆中有再循环上地壳物质的加入。

The Shengmikeng vein-type lead-zinc deposit is located in Huanggangshan volcano-tectonic depression of the Mesozoic volcanic belt in Northern Wuyi.The ore featured by veinlets and disseminations is hosted both inside the fault zone in the upper Jurassic Ehuling ignimbrite and the potassic trachyte porphyry.

摘 要:生米坑铅锌矿床位于北武夷中生代火山岩带的黄岗山火山盆地内,已知铅锌矿体呈脉状产于侏罗系上统鹅湖岭组流纹质熔结凝灰岩的断裂内,或呈细脉——浸染状分布于钾质粗面斑岩内,发育钾长石化、绿泥石化、硅化等蚀变。

The REE distribu- tion curves of Archaeozoic metamorphic rocks,Proterozoic granite,Tertiary basalt, Mesozoic granite,granite-porphyry,rhyolite,tuff,and gold ores are of right inclinnation, which indicates they enrich LREE and have completely similar Ce negative anomaly.

研究表明:太古代变质岩、元古代花岗岩、中生代花岗岩及花岗斑岩、流纹岩和凝灰岩、第三纪玄武岩及金矿石的稀土配分曲线均为右倾斜型,即富轻稀土,都有十分相似的 Ce 负异常。

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