[1]柏道远,钟响,贾朋远,等.湘西南苗儿山地区早燕山期花岗岩地球化学特征及形成环境[J].资源调查与环境,2015,36(04):235-243.
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湘西南苗儿山地区早燕山期花岗岩地球化学特征及形成环境()
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《资源调查与环境》[ISSN:2096-1871/CN:32-1865/P]

卷:
36
期数:
2015年04期
页码:
235-243
栏目:
基础地质
出版日期:
2015-12-15

文章信息/Info

作者:
柏道远钟响贾朋远熊雄
湖南省地质调查研究院
Author(s):
Hunan Institute of Geology Survey
关键词:
苗儿山地区早燕山期地球化学特征S型花岗岩后造山构造环境湘西南
Keywords:
early Yanshanian geochemical characteristics S-type granite post-orogenic tectonic setting southwestern Hunan Province
分类号:
P588.12+1
文献标志码:
A
摘要:
湘西南苗儿山地区早燕山期花岗岩形成于晚侏罗世早期,侵入于加里东期花岗岩(构成苗儿山岩体主体)和印支期花岗岩中。主要岩石类型为细粒 - 中粗粒斑状黑云母二长花岗岩,局部发育细粒二云母二长花岗岩。岩石 SiO2 76.02% 80.26% Al2O3 10.94% 12.88% K2O 3.42% 5.34% Na2O+K2O 5.37% 8.22% ASI 1.04 1.31 (平均 1.14 ),总体属铁质、钙碱性系列过铝质花岗岩类。微量元素中 Ba Sr P Ti 表现为强烈亏损, Rb 、( Th+U+K )、( La+Ce )、 Nd 、( Zr+Hf+Sm )、( Y+Yb+Lu )等则相对富集。稀土总量较低( 122.9 175.4 μ g/g ),轻稀土略富集( (La/Yb)N=2.55 3.79 ),具明显的负 Eu 异常(δ Eu=0.07 0.22 )。岩体 I Sr 值为 0.99007 1.15860 ε Nd(t) 值为 -9.20 -8.80 ,两阶段 Nd 模式年龄( t 2DM )为~ 1.7Ga C/MF-A/MF 图解显示源岩主要为变质泥质岩和变质杂砂岩。强过铝花岗岩样品的 Al2O3/TiO2 比值部分< 100 。上述地球化学特征表明花岗岩为 S 型花岗岩,源岩主要为中、上地壳酸性岩石,并有少量地幔物质加入 花岗岩主量和微量元素构造环境判别图解以及区域构造演化过程表明花岗岩形成于后造山构造环境。 岩浆形成与先期(中侏罗世)陆壳增厚升温及软流圈地幔的热传递有关
Abstract:

The early Yanshanian granites emplaced in early Late Jurassic in the Miao’ershan area, southwestern Hunan Province, were mainly intruded in the Caledonian and Indosinian granites and were mainly composed of fine grain and medium to coarse grain porphyritic biotite monzogranites with minor fine grain dimicaceous monzogranites. The rocks are of high silicon (SiO2=76.02% 80.26%), moderate aluminium (Al2O3=10.94% 12.88%), potassium (K2O=3.42% 5.34%), total alkali (Na2O+K2O=5.37% 8.22%) and high ASI values (1.04 1.31, 1.14 on average), showing features of the ferric, calc-alkaline perluminous granitoids. On the PM-normalized incompatible elements spiderdiagram, significant Ba, Sr, P and Ti trough and Rb, (Th+U+K), (La+Ce), Nd, (Zr+Hf+Sm) and (Y+Yb+Lu) humps are observed. The rocks have lower total REE content( Σ REE = 122.9 175.4 μ g/g), slightly enrichment of LREE (La/Yb)N= 2.55 3.79 and pronounced negative Eu anomaly( δ Eu = 0.07 0.22 ). As for isotope, they have ISr values of 0.99007 and 1.15860 , ε Nd(t ) values of -9.20 and -8.80 and t2DM ages of ~1.7 Ga. The C/MF-A/MF diagram indicates that the granites were derived from metamorphic mudstones and clastic rocks , Al2O3/TiO2 values of some strong perluminous granite samples are less than 100. All above geochemical characteristics reveal their S-type signatures and suggest that the granites were derived from partial melting of acid rocks of middle-upper crust with participation of mantle materials . Multiple oxide- and trace element-diagrams for discrimination of structural environment and regional tectonic geology show that the granites were formed in a post-orogenic tectonic setting . The forming of magma was related with the former thickening of crust in Middle Jurassic and the up-welling and heat transference of asthenosphere mantle.


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备注/Memo

备注/Memo:
基金项目 中国地质调查局地质调查项目“湖南1:25万武冈市和永州市幅区调修测”(项目编号:1212011120793)、“中国地质构造区划综合研究与区域地质志修编”(项目编号:1212010811032)联合资助。
第一作者简介: 柏道远 , 1967 年生 , , 研究员级高级工程师 , 博士,地质学专业,长期从事区域地质调查与基础地质研究。

更新日期/Last Update: 2015-12-30