华北陆块南缘老牛山杂岩体岩石成因:来自黑云母的信息
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摘要
老牛山杂岩体位于华北陆块南缘,由晚三叠世(印支期)和晚侏罗世(燕山期)花岗岩组成。在野外地质和岩相学观察的基础上,对老牛山杂岩体中的黑云母进行系统的化学成分研究。结果表明:不同时期不同岩性的黑云母成分变化不大,具有富Mg、Ti、Al、K的特征;黑云母主要是镁质黑云母;自印支期到燕山期黑云母的成分具有一定的变化规律,主要表现为TiO2、FeOT和Al2O3含量有所升高,而MgO含量逐渐降低;印支期花岗岩中黑云母结晶温度在600℃~700℃之间,结晶压力为0.98~1.95kbar,相应的侵位深度为3.72~7.38km;燕山期花岗岩中黑云母结晶温度在650℃~700℃之间,结晶压力为1.47~2.01kbar,相应的侵位深度为5.55~7.61km;老牛山杂岩体属于同熔型(I型)花岗岩,具有壳幔混源成因的特征,但花岗岩类成岩物质来源略有不同,印支期花岗岩较燕山期花岗岩的源区物质组成,可能幔源物质更多一些。
Laoniushan granitoid complex is located in the southern margin of North China Block,and consists of Late Triassic(Indosinian)and Late Jurassic(Yanshanian)granitoids.Based on the field geological and petrographic observation,the systematic chemical compositions of biotites were carried out.The results show that the compositions of biotites have a little change with high Mg,Ti,Al and K contents;these biotites are mainly Mg-biotites;the compositions of biotitesfor granitoids have certain change rule from Indosinian to Yanshanian,and mainly the contents of TiO_2,FeOT and Al_2O_3 increase,and the contents of MgO gradually decrease;biotites from Indosinian granites crystallize under temperature of 600 ℃-700 ℃,and pressure of 0.98-1.95 kbar,and the corresponding emplacement depth is 3.72-7.38 km;biotites from Yanshanian granitoids crystallize under temperature of 650 ℃-700 ℃,and pressure of 1.47-2.01 kbar,and the corresponding emplacement depth is 5.55-7.61 km;Laoniushan granitoid complex belongs to syntexis type(I-type)granitoid,and derives from a crust-mantle mixing source,while the diagenetic material sources of Indosinian and Yanshanian granitoids are slightly different,manifested as the mantle source material could be more in Indosinian granitoids.
Laoniushan granitoid complex is located in the southern margin of North China Block,and consists of Late Triassic(Indosinian)and Late Jurassic(Yanshanian)granitoids.Based on the field geological and petrographic observation,the systematic chemical compositions of biotites were carried out.The results show that the compositions of biotites have a little change with high Mg,Ti,Al and K contents;these biotites are mainly Mg-biotites;the compositions of biotitesfor granitoids have certain change rule from Indosinian to Yanshanian,and mainly the contents of TiO_2,FeOT and Al_2O_3 increase,and the contents of MgO gradually decrease;biotites from Indosinian granites crystallize under temperature of 600 ℃-700 ℃,and pressure of 0.98-1.95 kbar,and the corresponding emplacement depth is 3.72-7.38 km;biotites from Yanshanian granitoids crystallize under temperature of 650 ℃-700 ℃,and pressure of 1.47-2.01 kbar,and the corresponding emplacement depth is 5.55-7.61 km;Laoniushan granitoid complex belongs to syntexis type(I-type)granitoid,and derives from a crust-mantle mixing source,while the diagenetic material sources of Indosinian and Yanshanian granitoids are slightly different,manifested as the mantle source material could be more in Indosinian granitoids.
引文
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