川东北元坝地区中生代构造与动态热演化史——磷灰石、锆石(U-Th)/He定年分析

王杰; 秦建中; 刘文汇; 陶成; 腾格尔

doi:10.11781/sysydz201201019

川东北元坝地区中生代构造与动态热演化史——磷灰石、锆石(U-Th)/He定年分析

doi: 10.11781/sysydz201201019

王杰^1,2,
秦建中^1,2,
刘文汇^1,2,
陶成^1,2,
腾格尔^1,2

1.
中国石油化工集团公司油气成藏重点实验室, 江苏, 无锡, 214151
2. 中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所, 江苏, 无锡, 214126

基金项目: 国家重点基础研究(973项目)(2005CB422102);国家重大专项(2008ZX05005-01-02)

详细信息

作者简介:
王杰(1975- ),男,博士,高级工程师,从事油气地质与有机地球化学研究工作.E-mail:wangjie.syky@sinopec.com.

中图分类号: P597.3
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出版历程
- 收稿日期: 2011-01-08
- 修回日期: 2011-12-29
- 刊出日期: 2012-01-28

Mesozoic tectonics and dynamic thermal history in Yuanba area of northeastern Sichuan Basin：application of（U-Th）/He dating of apatite and zircon

Wang Jie^1,2,
Qin Jianzhong^1,2,
Liu Wenhui^1,2,
Tao Cheng^1,2,
Tenger^1,2

1.
SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu 214151, China
2. Wuxi Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China

摘要

摘要: 通过对川东北元坝地区须家河组(T₃x)—嘉定组(K₁j)钻井岩屑样品镜质体反射率和锆石、磷灰石(U-Th)/He定年分析,建立了该区He年龄—深度/温度动态演化模式,推断出元坝地区磷灰石He封闭温度为95℃左右。元坝地区T₃x-K₁j中生代地层基本都经历了磷灰石He封闭温度(95℃);所有样品未经历锆石He封闭温度,T₃x²-J₁z地层部分样品可能经历了约170℃的最高古地温。元坝地区中生代地层在古近纪—新近纪(0.2～36.4 Ma)发生重大冷却抬升剥蚀,剥蚀速率约为109.9m/Ma,K₁j及以上地层最大抬升剥蚀厚度约为4000m。系统揭示了该区动态热演化历史,中生代地层最高古地温接近于170～190℃,随后地层发生抬升,古地温下降;在36～176 Ma之间时,古地温在95～170℃之间;在0～36Ma时,现今地温小于95℃。
- 镜质体反射率 /
- 磷灰石和锆石U-Th/He定年 /
- 剥蚀厚度 /
- 热演化史 /
- 元坝地区 /
- 川东北
Abstract: In Yuanba area of the northeastern Sichuan Basin,vitrinite reflectance and(U-Th)/He dating analyses of apatite and zircon in chip samples from the Xujiahe(T₃x)-Jiading(K₁j) Formations were carried out.A dynamic evolution model based on He age and depth/temperature was set up,by means of which we concluded that the He closure temperature of apatite was about 95℃.Most of the Mesozoic strata(T₃x-K₁j) in the study area experienced the He closure temperature of apatite(95℃) while no sample experienced the He closure temperature of zircon,and some samples from T₃x²-J₁z underwent the maxium palaeogeothermal of about 170℃.From Paleogene to Neogene(0.2-36.4 Ma),the Mesozoic strata in Yuanba area went through a severe cooling uplift and denudation with the denudation rate of 109.9 m/Ma.In K₁j and the overlying strata,the maximum denudation thickness was about 4000 m.The dynamic thermal evolution history in the study area was illustrated systematically as followed.In Mesozoic,the maximum palaeogeothermal of strata was 170-190℃.As strata upraise,palaeogeothermal decreased.From 36 to 176 Ma,palaeogeothermal was 95-170℃.From 0 to 36 Ma,the present geotemperature is below 95℃.
- vitrinite reflectance /
- U-Th/He dating of apatite and zircon /
- denudation thickness /
- thermal evolution history /
- Yuanba area /
- northeastern Sihuan Basin

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