Sediment Provenance and Its Direction of Yueguifeng Formation in Lishui-Jiaojiang Depression:Evidence from Detrital Zircon U-Pb Chronology and Heavy Minerals
Yueguifeng Formation is the main source rock in Lishui-Jiaojiang depression,but it's poor research on provenance which brings great difficulties to oil and gas exploration.Based on zircon U-Pb dating and heavy mineral analysis,it was systematically analyzed and compared for the provenance characteristics,differences and geological significance of the Yueguifeng Formation.The results show that the provenance is mainly medium-acid igneous rocks main ages of which are 130-100 Ma with a small amount of metamorphic rocks,mainly containing stable heavy minerals such as zircon,hematite and magnetite.The provenance of Jiaojiang depression and east Lishui sub-depression mainly came from Yandang uplift,and the provenance of west Lishui sub-depression mainly came from Fujian-Zhejiang uplift.A small amount of igneous and metamorphic rocks came from the basement near the study area.Zircon roundness preference and ZTR values are higher,indicating that the provenance was transported over medium and long distances,which is conducive to the enrichment of quartz and feldspar minerals in medium-acid magmatic rocks,forming quartz sandstone reservoirs with good compaction resistance.
provenance analysiszircon U-Pb isotopic datingheavy mineral analysisore deposit geology
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