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首页> 外文期刊>Marine Science Bulletin >Petrology, Geochemistry and Nd-Sr-Pb Isotopic Properties of Volcanic Rocks in Daheishan Island, Penglai, Shandong Province
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Petrology, Geochemistry and Nd-Sr-Pb Isotopic Properties of Volcanic Rocks in Daheishan Island, Penglai, Shandong Province

机译：山东蓬莱大黑山岛火山岩的岩石学，地球化学和Nd-Sr-Pb同位素特征

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摘要

The major elements, trace elements. K-Ar age and Sr-Nd-Pb isotopie systems of the Cenozoic volcanic rocks in Daheishan Island and Cishan, Penglai, Shandong Province are measured. The volcanic rocks ( olivine-nephelinite and nephcline-basanite ) in Daheishan Island erupted periodically in an interval of 0.32 Ma, from 8.72 Ma. 8.39 Ma. 8.08 Ma to 7.73 Ma. The volcanic rocks arc all rich in light REEs. They are similar to the OIB-type alkali basalt in the trace elements normalized model by primordial mantle: rich in high field elements such as Nb and Ta, and imcompatible elements such as Cs. Rb, Ba, Th. U. The volcanic rocks show a depletion of K and Rb elements. It is suggested by the trace elements that the olivine-nephelinite in Daheishan Island is originated from deep resources under the continental mantle. ε Nd (0) values of the volcanic rocks in Daheishan Island and Cishan are 5.31～8.51 and 7.33 respectively, suggesting that the volcanic rocks are from the depleted mantle resources, which have higher Sm/Nd ratios than the CHUR. ~(143)Nd /~(144)Nd ratios ot Daheishan Island olivine-nephelinite and Cishan alkali basalts are 0.512 910～0.513 074 and 0.513 014 respectively. The ~(87)Sr /~(86)Sr of Daheishan Island volcanic rocks are lower than that of Cishan, 0.703 427 ～0.703 482 and 0.703 895 respectively. The Daheishan Island olivine-nephelinite has the Pb isotopie values as follows: ~(206)Pb/~(204)Pb= 18.028 9 ～17.972 8. ~(207)Pb / ~(204)Pb = 15.435 8 ～15.402 2 and ~(208)Pb /~(204)Pb = 38.087 6～37.997 5. lower than those of Cishan basanite. The Cishan basanite has ~(206)Pb/~(204)Pb= 18.240 1. ~(207)Pb /~(204)Pb= 15.564 5 and ~(208)Pb /~(204)Pb = 38.535. The authors suggest that the olivine-nephelinite in Daheishan Island is similar to the E-type MORB or Hawaii OIB, and the alkali basalts in Cishan similar to the Kerguelen OIB. The dominant mantle components of DM+PREMA and perhaps DM ( Dupal type ) are the dominant mantle components for volcanic rocks in Daheishan Island and Cishan. The PREMA component plays an important role.
机译：主要元素，微量元素。测量了山东蓬莱大黑山岛和慈山新生代火山岩的K-Ar年龄和Sr-Nd-Pb同位素系统。大黑山岛上的火山岩（橄榄石-霞石和霞石-玄武岩）以0.32 Ma的间隔从8.72 Ma周期性喷发。 8.39毫安。 8.08至7.73马。火山岩都富含轻稀土元素。它们与原始地幔归一化模型中的痕量元素归一化模型中的OIB型碱式玄武岩相似：富含高磁场元素（例如Nb和Ta）和不相容元素（例如Cs）。 Rb，Ba，Th U.火山岩显示出K和Rb元素的消耗。微量元素表明，大黑山岛的橄榄石软霞石起源于大陆幔下的深部资源。大黑山岛和磁山的火山岩的εNd（0）值分别为5.31〜8.51和7.33，表明该火山岩来自贫化的地幔资源，Sm / Nd比值比CHUR高。大黑山岛橄榄石-软霞石和慈山碱玄武岩的〜（143）Nd /〜（144）Nd比分别为0.512 910〜0.513 074和0.513 014。大黑山岛火山岩的〜（87）Sr /〜（86）Sr分别低于旗山，〜0.703 427〜0.703 482和0.703 895。大黑山岛橄榄石霞石具有如下的Pb同位素值：〜（206）Pb /〜（204）Pb = 18.028 9〜17.972 8.〜（207）Pb /〜（204）Pb = 15.435 8〜15.402 2和〜（208）Pb /〜（204）Pb = 38.087 6〜37.997 5.低于磁山basanite。磁山basanite具有〜（206）Pb /〜（204）Pb = 18.240 1.〜（207）Pb /〜（204）Pb = 15.564 5和〜（208）Pb /〜（204）Pb = 38.535。作者认为，大黑山岛的橄榄石霞石与E型MORB或夏威夷OIB相似，而在旗山的碱性玄武岩与Kerguelen OIB相似。 DM + PREMA和DM（Dupal型）的主要地幔成分是大黑山岛和慈山火山岩的主要地幔成分。 PREMA组件起着重要作用。

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