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Evolution of Petroleum-Bearing Fluid Systems: Insights from Growth Dynamics of Quartz Crystals

Evolution of Petroleum-Bearing Fluid Systems: Insights from Growth Dynamics of Quartz Crystals. Phillip D. Ihinger , Department of Geology, University of Wisconsin-Eau Claire Eau Claire, WI 54701.

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Evolution of Petroleum-Bearing Fluid Systems: Insights from Growth Dynamics of Quartz Crystals

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  1. Evolution of Petroleum-Bearing Fluid Systems:Insights from Growth Dynamics of Quartz Crystals Phillip D. Ihinger, Department of Geology,University of Wisconsin-Eau Claire Eau Claire, WI 54701 Quartz-filled hydrothermal veins are the fossilized remnants of fluid-filled fractures that facilitate the majority of material and heat transfer within the Earth’s crust. The behavior of hydrothermal systems governs the mobility of dissolved ore species and organic compounds related to oil and natural gas formation. The timing and evolution of natural hydrothermal channels are poorly known. We have recently shown the potential of micro-FTIRanalyses for revealing variable growth evolutions of individual quartz crystals within veins of variable hydrothermalgrade and thus for offering insights into the thermal and chemical evolution of natural hydrothermal systems... New Findings: Previous Work: IR analyses reveal 6 sector zones associated with growth on terminal r & zrhombohedral faces of a specimen from Minas Geras, Brazil (Ihinger & Zink, 2000, Nature, 404,p 865- 869). FTIR analyses document a 2-stage growthevolution for each crystal in the LeChangvug: an inner ‘core’ formed by growth entirely on rhombohedralfaces, and an outer rind of even thickness formed by addition of material onto each of the six prism faces. Stage 1 Stage 2 Wafers cut perpendicularto the c-axis of each of fourcrystalssampled from the vug all reveal a 2-stagegrowthevolution. FTIR analyses distinguishgrowthon m-faces from growth on r- & z-faces.Boundaries between sector zones align with observed optical features. Multiple crystals were sampled from a single hydrothermal vug from LeChang, China. Finite element modeling can simulate the natural processand successfully reproduce diffusion profiles observed innatural samples.

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