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Spatiotemporal history of fault–fluid interaction in the Hurricane fault, western USA

机译:美国飓风断层飓风故障中的时空史运史

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The Hurricane fault is a ~250?km long,west-dipping, segmented normal fault zone located along the transitionbetween the Colorado Plateau and the Basin and Range tectonic provinces in the western USA. Extensive evidence of fault–fluid interaction includes calcitemineralization and veining. Calcite vein carbon (δ ~(13)C_(VPDB))and oxygen (δ ~(18)O_(VPDB)) stable isotope ratios range from?4.5?‰ to 3.8?‰ and from ?22.1?‰ to ?1.1?‰,respectively. Fluid inclusion microthermometry constrains paleofluidtemperatures and salinities from 45 to 160?~(°)C and from 1.4?wt?% to 11.0?wt?%as NaCl, respectively. These data suggest mixing between two primary fluidsources, including infiltrating meteoric water (70±10?~(°)C, ~1.5?wt?% NaCl, δ ~(18)O_(VSMOW) ~ - 10 ?‰) and sedimentary brine (100±25?~(°)C, ~11?wt?% NaCl, δ ~(18)O_(VSMOW)?~?5?‰). Interpretedcarbon sources include crustal- or magmatic-derived CO_(2), carbonatebedrock, and hydrocarbons. Uranium–thorium (U–Th) dates from five calcite vein samples indicatepunctuated fluid flow and fracture healing at 539±10.8 (1σ ),287.9±5.8, 86.2±1.7, and 86.0±0.2?ka in the upper500?m of the crust. Collectively, data predominantly from the footwalldamage zone imply that the Hurricane fault imparts a strong influence on theregional flow of crustal fluids and that the formation of veins in theshallow parts of the fault damage zone has important implications for theevolution of fault strength and permeability.
机译:飓风断层是一个〜250?KM长,西浸,位于Colorado高原和美国西部的流域和盆地和范围构造省的过渡时期的正常断层区。故障流体相互作用的广泛证据包括转化术和脉络。方解石静脉碳(δ〜(13)C_(VPDB))和氧气(δ〜(18)O_(VPDB))稳定的同位素比范围从Δ4.5?‰到3.8?‰和来自?22.1 ?‰到?1.1?‰。流体包裹物微米分别将古流血培养物和盐度从45-160℃和1.4〜(°)〜(°)C中的盐水分别约束。这些数据建议在两个初级流体之间混合,包括渗透血液水(70±10?〜(°)C,〜1.5〜(℃,Δ%NaCl,δ〜(18)O_(vsmow)〜10?‰)和沉积盐水(100±25?〜(°)c,〜11?wt?%NaCl,δ〜(18)O_(vsmow)?〜?5?‰)。解释碳源包括地壳或岩浆衍生的CO_(2),碳酸纤维包衣和碳氢化合物。铀 - 钍(U-TH)来自五种方解石静脉样品的日期,显示出539±10.8(1σ),287.9±5.8,86.2±1.7和86.0±0.2?KA在539±10.8(1σ),287.9±5.8,86.0±0.2?米的地壳。总的来说,主要来自脚下壁罩区的数据意味着飓风断层赋予地壳流体的强烈影响力强,并且在故障损伤区的TheShownown opth部分中的静脉形成对故障强度和渗透性的重要意义。

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