岩性油气藏
巖性油氣藏
암성유기장
LITHOLOGIC RESERVOIRS
2011年
6期
73-78
,共6页
邹瑜%陈振林%苗洪波%农军年
鄒瑜%陳振林%苗洪波%農軍年
추유%진진림%묘홍파%농군년
基底%火成岩%花岗岩%锆石定年%伊通盆地
基底%火成巖%花崗巖%鋯石定年%伊通盆地
기저%화성암%화강암%고석정년%이통분지
basement%igneous rocks%granites%zircon dating%Yitong Basin
为了确定伊通盆地基底的形成时期,对伊通盆地6个基底火成岩样品进行了LA-ICP-MS锆石U-Pb定年研究。锆石的阴极发光（CL）图像显示,6个基底火成岩岩心的锆石自形程度较好,且具有典型的岩浆生长震荡环带。定年结果表明：岔路河断陷的C24井2484.2m处的黑云母二长花岗岩形成于（176.8±1.7）Ma,C17井3153.0m处的碎裂岩化条纹长石二长岩形成于（171.8±3.2）Ma;鹿乡断陷的X5井、L2井以及莫里青断陷的Y3井和Y53井基底火成岩分别形成于（170.3±3.4）Ma,（169.1±4.5）Ma,（247.2±3.4）Ma和（186.6±2.5）Ma。伊通盆地基底火成岩其他锆石定年结果表明,伊通盆地基岩（花岗岩）的年龄主要为170～336Ma,其中绝大多数形成于燕山期,少量形成于海西期;各断陷的花岗岩分布存在差异,岔路河断陷与鹿乡断陷花岗岩基本形成于燕山期,而莫里青断陷花岗岩则在海西期、印支期及燕山期均有形成。
為瞭確定伊通盆地基底的形成時期,對伊通盆地6箇基底火成巖樣品進行瞭LA-ICP-MS鋯石U-Pb定年研究。鋯石的陰極髮光（CL）圖像顯示,6箇基底火成巖巖心的鋯石自形程度較好,且具有典型的巖漿生長震盪環帶。定年結果錶明：岔路河斷陷的C24井2484.2m處的黑雲母二長花崗巖形成于（176.8±1.7）Ma,C17井3153.0m處的碎裂巖化條紋長石二長巖形成于（171.8±3.2）Ma;鹿鄉斷陷的X5井、L2井以及莫裏青斷陷的Y3井和Y53井基底火成巖分彆形成于（170.3±3.4）Ma,（169.1±4.5）Ma,（247.2±3.4）Ma和（186.6±2.5）Ma。伊通盆地基底火成巖其他鋯石定年結果錶明,伊通盆地基巖（花崗巖）的年齡主要為170～336Ma,其中絕大多數形成于燕山期,少量形成于海西期;各斷陷的花崗巖分佈存在差異,岔路河斷陷與鹿鄉斷陷花崗巖基本形成于燕山期,而莫裏青斷陷花崗巖則在海西期、印支期及燕山期均有形成。
위료학정이통분지기저적형성시기,대이통분지6개기저화성암양품진행료LA-ICP-MS고석U-Pb정년연구。고석적음겁발광（CL）도상현시,6개기저화성암암심적고석자형정도교호,차구유전형적암장생장진탕배대。정년결과표명：차로하단함적C24정2484.2m처적흑운모이장화강암형성우（176.8±1.7）Ma,C17정3153.0m처적쇄렬암화조문장석이장암형성우（171.8±3.2）Ma;록향단함적X5정、L2정이급막리청단함적Y3정화Y53정기저화성암분별형성우（170.3±3.4）Ma,（169.1±4.5）Ma,（247.2±3.4）Ma화（186.6±2.5）Ma。이통분지기저화성암기타고석정년결과표명,이통분지기암（화강암）적년령주요위170～336Ma,기중절대다수형성우연산기,소량형성우해서기;각단함적화강암분포존재차이,차로하단함여록향단함화강암기본형성우연산기,이막리청단함화강암칙재해서기、인지기급연산기균유형성。
In order to determine the formation period of Yitong basement accurately, six zircon samples are selected to carry out the study on LA-ICP-MS U-Pb dating of zircon. Zircons from the basement igneous rock are euhedral in shape and show the typical oscillatory zoning with magmatic origin. The dating results indicate that the biotite-monzonitic granite at the depth of 2 484.2 m in C24 well in Chaluhe fault depression formed in （176.8±1.7）Ma, the crack lithification perthitr monzonite at the depth of 3 153.0 m in C17 well formed in （171.8±3.2）Ma, the basement igneous rocks in X5 and L2 wells in Luxiang fault depression respectively formed in （170.3±3.4）Ma and （169.1±4.5）Ma, and the basement igneous rocks in Y53 and Y3 wells in Moliqing fault depression respectively formed in（247.2±3.4）Ma and（186.6±2.5）Ma. In combination with other U-Pb dating, it is considered that the age of basement igneous rocks in Yitong Basin is mainly of 170～336 Ma, and the most formed in Yanshanian, and a little formed in Hercynian. The distribution of granite in each fault depression is different. The most of granites in Chaluhe and Luxiang fault depression formed in Yanshanian, while in Moliqing fault depression the granites formed in Hercynian, Indosinian and Yanshanian.
