鲁西中生代高Mg闪长岩的成因: 年代学与岩石地球化学证据

杨承海; 许文良; 杨德彬; 刘长春; 柳小明; 胡兆初

鲁西中生代高Mg闪长岩的成因: 年代学与岩石地球化学证据

1.
吉林太学地球科学学院，吉林长春 130061
2.
山东省地质矿产局，山东济南 250013
3.
西北太学大陆动力学重点实验室，陕西西安 710069

基金项目:

国家自然科学基金项目 40472033

国家自然科学基金项目 40133020

详细信息

作者简介:
杨承海(1964-), 男, 高工, 博士研究生, 主要从事火成岩石学研究

通讯作者:
许文良, E-mail: xuwl@263.net

中图分类号: P588.12
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出版历程
- 收稿日期: 2005-10-18
- 刊出日期: 2006-01-25

Petrogenesis of the Mesozoic High-Mg Diorites in West Shandong: Evidence from Chronology and Petro-geochemistry

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
Bureau of Geology and Mineral Resources of Shandong Province, Jinan 250013, China
3.
Key Laboratory of Continental Dynamics, Northrucestern University, Xian 710069, China

摘要

摘要: 鲁西高Mg闪长岩分布较为广泛, 莱芜铁铜沟岩体和淄博金岭岩体是其典型代表.铁铜沟岩体早期苏长辉长岩和晚期辉石闪长岩、金岭黑云母闪长岩的LA-ICPMS U-Pb谐和加权平均年龄分别为(131.4±4.9)Ma(n=15)、(134.5±2.3) Ma(n=13)和(132.8±4.2)Ma(n=12), 它们代表了岩体的侵位结晶年龄——早白垩世.铁铜沟岩体晚期辉石闪长岩中浑圆状锆石的LA-ICPMS U-Pb谐和年龄为(2 513±54)Ma(n=8), 代表了华北克拉通基底的存在.该类岩石以高Mg^# (> 60)、富钠、富含轻稀土元素、贫重稀土元素以及高场强元素(Nb、Ta、Zr、Hf)的明显亏损为特征, 显示埃达克岩(adakite) 的特征.该类岩石中地幔橄榄岩包体的广泛存在以及高Mg的特征表明原始岩浆的地幔成因, 而Sr-Nd同位素组成(I_sr为0.704 75-0.707 72和ε_Nd(t)值为-3.95--13.30)和高场强元素(Nb、Ta、Zr、Hf)的亏损以及太古代继承锆石的存在均暗示岩浆源区应有陆壳物质的涉入.铁铜沟岩体和金岭岩体闪长岩成分的差异应归因于岩浆源区性质的差异和部分熔融程度的不同.基于该类岩石的地球化学和所含包体, 同时结合华北克拉通东部中生代早期岩石圈演化历史, 可以认为鲁西中生代早白垩世高Mg闪长岩的形成应为拆沉的岩石圈(地幔+下地壳)与软流圈混熔的产物.
- 高Mg闪长岩 /
- 年代学 /
- 地球化学 /
- 中生代 /
- 鲁西
Abstract: High-Mg diorites occur widely in western Shandong: the Tietonggou and Jinling intrusions are typically representative. The weighted mean 206pb/238U ages from LA-ICPMS zircon U-Pb dating results for early norite-diorite, late pyroxene-diorite from the Tietonggou intrusion and biotite-diorite from the Jinling intrusion are (131. 4±4. 9)Ma(n = 15), (134. 5±2. 3)Ma(n=13), (132. 8±4. 2)Ma(n=12), respectively, implying that they were formed in the Early Cretaceous. The weighted mean ²⁰⁷Pb/²⁰⁶Pb age for round zircons from late pyroxene-diorite from the Tietonggou intrusion is (2 513±54)Ma(n=8), suggesting that the basement of the North China craton should exist in the research area. The high-Mg diorites are characterized by enrichment in Mg^#, Na, and light rare earth elements (LREE). They are poor in heavy rare earth elements (HREE) and high field strength elements (HFSE), being similar to adakite. The occurrence of the mantle peridotite xenoliths and the high-Mg feature for these intrusive rocks imply that their primary magma should be derived from the upper mantle. However, Sr-Nd isolopic compositions (I_sr: 0.704 75 - 0. 707 72; ε_Nd(t) values: -3. 95 to - 13. 30), depletion in HFSE, and the occurrence of the Archean inherited zircons suggest that crustal materials be involved in the derivation of primary magma The compositional difference between the diorites from the Tietonggou and Jinling intrusions could be attributed to magma sources and partial melting degrees. It is considered that the Early Cretaceous high-Mg diorites were formed by the mixed melting of the delaminated lithosphere (lithospheric mande+crust) and asthenosphere, based on their geochemistry, the mantle-derived xenoliths, and the Early Mesozoic lithospheric evolutionary history of the eastern North China craton.
- high-Mg diorile /
- chronology /
- geochemistry /
- Mesozoic /
- West Shandong.

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图 1 鲁西地区地质略图

1.第四系; 2.第三系; 3.中生界; 4.古生界; 5.太古界; 6.中生代青山期火山岩; 7.辉长岩; 8.高镁闪长岩; 9.断层; 10.采样点

Fig. 1. Sketch geologic map of West Shandong

下载: 全尺寸图片幻灯片

图 2 鲁西高镁闪长岩中锆石的阴极发光(CL)图像

A.铁铜沟岩体苏长闪长岩中的锆石的阴极发光(CL)图像; B.铁铜沟岩体辉石闪长岩中的2种锆石的阴极发光(CL)图像; C.金岭岩体黑云母闪长岩中锆石的阴极发光(CL)图像

Fig. 2. Cathodoluminescence (CL) images of selected zircons from the high-Mg diorite in West Shandong

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图 3 鲁西中生代高Mg闪长岩中锆石LA-ICPMS U-Pb谐和图

a.莱芜铁铜沟岩体早期苏长闪长岩; b.莱芜铁铜沟岩体辉石闪长岩; c.为图b的底部放大; d.金岭岩体黑云母闪长岩

Fig. 3. Concordia diagram showing age data from LA-ICPMS U-Pb zircon dating of the high-Mg diorites in West Shandong

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图 4 鲁西高镁闪长岩的SiO₂-(Na₂O+K₂O)变异图

碱性和亚碱性之间的界限引自Irvine and Baragar (1971)

Fig. 4. SiO₂ vs.(Na₂ O+K₂O) variation diagram for high-Mg diorites in West Shandong

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图 5 鲁西高镁闪长岩的球粒陨石标准化REE配分型式(a)和原始地幔标准化的微量元素蛛网图(b)

原始地幔标准化数据引自Sun and McDonough(1989)

Fig. 5. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spider diagram (b) of high-Mg dio-rites from West Shandong

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图 6 鲁西中生代高Mg闪长岩(⁸⁷Sr/⁸⁶Sr)_i与ε_Nd(t)(130 Ma)变异图

资料来源: 华北克拉通下地壳和上地壳引自Jahn et al.(1999);扬子克拉通下地壳引自Chen and Jahn(1998); 大陆上地壳引自Jahn et al.(1988); 角峪岩体引自Xu et al.(2004)

Fig. 6. Initial (⁸⁷Sr/⁸⁶Sr)_i vs ε_Nd(t)(130 Ma) diagram for the Mesozoic high-Mg diorites in West Shandong

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表 1 鲁西高镁闪长岩锆石LA-ICPMS U-Pb定年数据

Table 1. LA-ICPMS zircon U-Pb dating data of the high-Mg-diorite from western Shandong

表 2 鲁西中生代高镁闪长岩的主量、微量元素含量和Sr-Nd同位素组成

Table 2. Elemental content and Sr-Nd isotopic composition of the Mesozoic high-Mg diorites from West Shandong

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