吉林地质
吉林地質
길임지질
Jilin Geology
2015年
3期
55-61
,共7页
孙英华%周树亮%权承珍%孙超
孫英華%週樹亮%權承珍%孫超
손영화%주수량%권승진%손초
同位素年龄%3号含矿岩体%红旗岭矿区%吉林省
同位素年齡%3號含礦巖體%紅旂嶺礦區%吉林省
동위소년령%3호함광암체%홍기령광구%길림성
isotopic age%No.3 ore-bearing rock mass%Hongqiling mining area%Jilin Province
通过对红旗岭矿区3号含矿岩体同位素年龄研究,该岩体锆石U-Pb年龄为(207±3)Ma,黑云母Ar-Ar年龄为(212.5±2.5)Ma,矿石Re-Os等时线年龄为(234±28)Ma,表明该含矿岩体形成于三叠纪晚期。该年龄和近年来对含矿基性-超基性岩体同位素年龄测定结果基本一致(205~230 Ma),说明它们均为三叠纪晚期岩浆作用的产物。根据岩体围岩年龄(Rb-Sr全岩等时线年龄(524±16)Ma和(357±23)Ma),认为该岩体成岩成矿主要形成于印支中晚期,是同一期构造岩浆活动的产物,岩浆及成矿物质来源具有同源性,从而形成了具有相同成因的矿床类型。
通過對紅旂嶺礦區3號含礦巖體同位素年齡研究,該巖體鋯石U-Pb年齡為(207±3)Ma,黑雲母Ar-Ar年齡為(212.5±2.5)Ma,礦石Re-Os等時線年齡為(234±28)Ma,錶明該含礦巖體形成于三疊紀晚期。該年齡和近年來對含礦基性-超基性巖體同位素年齡測定結果基本一緻(205~230 Ma),說明它們均為三疊紀晚期巖漿作用的產物。根據巖體圍巖年齡(Rb-Sr全巖等時線年齡(524±16)Ma和(357±23)Ma),認為該巖體成巖成礦主要形成于印支中晚期,是同一期構造巖漿活動的產物,巖漿及成礦物質來源具有同源性,從而形成瞭具有相同成因的礦床類型。
통과대홍기령광구3호함광암체동위소년령연구,해암체고석U-Pb년령위(207±3)Ma,흑운모Ar-Ar년령위(212.5±2.5)Ma,광석Re-Os등시선년령위(234±28)Ma,표명해함광암체형성우삼첩기만기。해년령화근년래대함광기성-초기성암체동위소년령측정결과기본일치(205~230 Ma),설명타문균위삼첩기만기암장작용적산물。근거암체위암년령(Rb-Sr전암등시선년령(524±16)Ma화(357±23)Ma),인위해암체성암성광주요형성우인지중만기,시동일기구조암장활동적산물,암장급성광물질래원구유동원성,종이형성료구유상동성인적광상류형。
Through study on isotope age of No.3 ore-bearing rock mass in Hongqiling mining area, the zircon U-Pb age 207±3Ma, biotite Ar-Ar age 212.5±2.5Ma, ore Re-Os isochrones age 234±28Ma, which show that the ore-bearing rock mass formed in Late Triassic. The age are basically same with the ore-bearing basic-ultrabasic rock isotopic age determination results in recent years (205Ma ~ 230Ma), that show they are the products of the Late Triassic magmatism. According to the ages of wall rock (Rb-Sr whole rock isochron age 524±16Ma and 357±23Ma) . We think that rock mass diagenetic mineralizationare mainly formed in the Late Indosinian, is the product of the same period tectonic magmatic activity. Magma and ore-forming material have homology sources, thus deposit types of the same genesis are formed.