[1]張 巖,馬宏杰,樊永成,等.浙江遂昌柘岱口地區酸性碎斑熔巖地質特征及成因[J].華東地質,2017,38(01):1-11.[doi:10.16788/j.hddz.321865/P.2017.01.001]
 ZHANG Yan,MA Hong-jie,FAN Yong-cheng,et al.Geological characteristics and origin of the felsic porphyroclastic lavas in the Zhedaikou area in Suichang, Zhejiang Province[J].East China Geology,2017,38(01):1-11.[doi:10.16788/j.hddz.321865/P.2017.01.001]
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浙江遂昌柘岱口地區酸性碎斑熔巖地質特征及成因()
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《華東地質》[ISSN:2096-1871/CN:32-1865/P]

卷:
38
期數:
2017年01期
頁碼:
1-11
欄目:
基礎地質
出版日期:
2017-03-15

文章信息/Info

Title:
Geological characteristics and origin of the felsic porphyroclastic lavas in the Zhedaikou area in Suichang, Zhejiang Province
文章編號:
2096-1871(2017)01-001-11
作者:
張 巖馬宏杰樊永成齊巖辛
(浙江省地質調查院,杭州 311203)
Author(s):
ZHANG YanMA Hong-jieFAN Yong-chengQI Yan-xin
(Zhejiang Institute of Geological Survey, Hangzhou 311203,China)
關鍵詞:
成因模式 巖性巖相特征 酸性碎斑熔巖 遂昌柘岱口地區 浙江
Keywords:
genetic model lithofacies features felsic porphyroclastic lavas Zhedaikou area of Suichang Zhejiang Province
分類號:
P581
DOI:
10.16788/j.hddz.321865/P.2017.01.001
文獻標志碼:
A
摘要:
通過野外地質調查及室內綜合研究,進一步闡明浙江遂昌柘岱口地區碎斑熔巖地質特征及成因。宏觀上劃分了碎斑熔巖相帶,查明了碎斑熔巖時空分布及與圍巖的接觸關系; 微觀上通過巖石地球化學、同位素年代學及鋯石飽和溫度計算等方法研究該碎斑熔巖。研究區碎斑熔巖受控于柘岱口—湖山NE向大型火山構造洼地復活型破火山,具有侵出—溢流特點,為復合穹丘狀地質體。巖漿演化在時空上具有連續性,具有分異巖漿“溢流—侵出—侵入”過程。巖石具有典型的連續不等粒碎斑結構和珠邊結構,富堿,K2O+Na2O為8.54%~9.25%,A/CNK為0.88~1.04,為準鋁質鉀玄巖系列,富集Nb、Ta、Zr、Hf等高場強元素和Rb、Sr、Ba、Th等大離子親石元素。巖石成巖溫度為803 ℃~884 ℃,具有高溫淺成特點。全巖Rb-Sr等時線年齡為123 Ma,為早白堊世中期九里坪期巖漿活動的產物,是殼—幔混合I型碎斑熔巖,屬于活動大陸邊緣靠板內的構造環境。
Abstract:
This study carried out a detailed analysis of porphyroclastic lavas to understand its geological characteristics and origin based on field survey and comprehensive research. Through study of microscopic lithofacies, lithogeochemistry, isotopic chronology and zircon saturation temperature, porphyroclastic lava facies belt was defined at macro level, and spatial-temporal distribution of porphyroclastic lavas and its contact relationship with the surrounding rock was ascertained. The porphyroclastic lavas in the study area are controlled by a revived caldera in the large-scale NE-trending volcanic structural depression in Zhedaikou-Hushan and characterized by extrusion and effusion, suggesting a composite dome. Magma evolution of the porphyroclastic lavas shows a certain continuation spatially and temporally, indicating a magmatic differentiation process from effusion to extrusion to intrusion. Porphyroclastic lavas with typical porphyroclastic structure and pearl-edge texture are enriched in HFSEs(Nb, Ta, Zr, Hf)and LILEs(Rb, Sr, Ba, Th), and also rich in alkali(K2O+Na2O=8.54%~9.25%), A/CNK=0.88~1.04, suggesting the lavas belong to a metaluminous shoshonite series. The diagenetic temperatures of the lavas range from 803 ℃ to 884 ℃,indicative of high temperature hypabyssal. A Rb-Sr isochron age of 123 Ma suggests that the lavas were the result of Early Cretaceous magmatic activity. Out study shows that the porphyroclastic lavas and associated granite are co-magmatic I-type rocks derived from crust-mantle mixing source, and generated in an active continental margin close to intraplate.

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備注/Memo

備注/Memo:
*收稿日期:2016-05-11 修訂日期:2016-07-18 責任編輯:譚桂麗
基金項目:中國地質調查局項目“1:25萬衢州市幅(H50C003004)區域地質調查(項目編號:1212010011604、1212011120872、121201122549)”資助。
第一作者簡介:張巖,1961年生,男,高級工程師,從事區域地質調查、地質遺跡調查與評價研究。
更新日期/Last Update: 2017-03-23
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