Elemental abundance patterns and Sr-, Nd- and Hf-isotope systematics for the Yellowstone hotspot and Columbia River flood basalts: Bearing on petrogenesis
Elemental abundance patterns and Sr-, Nd- and Hf-isotope systematics for the Yellowstone hotspot and Columbia River flood basalts: Bearing on petrogenesis
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黄石热点和哥伦比亚河溢流玄武岩的元素丰度模式和 Sr、Nd 和 Hf 同位素系统学：对岩石成因的影响
DOI：
10.1016/j.chemgeo.2019.03.012
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发表时间：
2019
期刊：
影响因子：
3.9
通讯作者：
Cabato, Joan A.
中科院分区：
文献类型：
--
作者：
Stefano, Christopher J.;Mukasa, Samuel B.;Cabato, Joan A.
美国西北部的黄石热点轨迹有1700万年的历史，始于大量的哥伦比亚河玄武岩（CRB）的喷发，并随着北美板块向西漂移，产生了一条向东的轨迹，其中蛇河平原（SRP）的双峰流纹岩和玄武岩喷发中心。我们已经产生了第一个铪同位素数据玄武岩在这个大火成岩省沿着与散装岩石微量元素丰度模式和Sr-Nd同位素比值，以评估假设的亲缘关系，共位于rhythmic整个热点轨道。所有三种元素的同位素组成跨越了在全世界幔源玄武岩中观察到的组成范围。新的ε Hf值在CRB部分地区的最高值+11.3和一些晚期SRP玄武岩的最低值-8.3之间变化，受到地理控制，类似于Sr和Nd同位素首次记录的跨越“0.706 Sr线”的变化，该线标志着西部薄增生的年轻海洋岩石圈和岛弧之间的边界，以及东部厚而古老的花岗岩化地壳。这一观测结果表明，有显着的岩石圈控制的同位素组成的玄武岩和流纹岩与黄石热点track.Modeling同化和分离结晶（AFC）过程中的7个玄武岩熔岩流填充2马大弯岭破火山口在梅萨福尔斯，爱达荷州，在热点轨迹东端附近，地壳对Nd和Hf浓度收支的贡献随时间系统地增加，并且是显著的。新的和以前公布的大块岩石主要氧化物浓度的比较（例如，碱金属Na ~ 2 O和K ~ 2 O）与我们以前发表的橄榄石熔融包裹体中H ~ 2 O、Cl、F和S的数据表明，挥发分可能来自地壳下的岩石圈地幔，并在岩浆上升和结晶过程中广泛脱气。
The Yellowstone hotspot track in the northwestern US has a 17-myr history that began with eruption of the voluminous Columbia River basalts (CRB), and produced an eastward track with the bimodal rhyolite and basaltic eruptive centers of the Snake River Plain (SRP) as the North American Plate drifted westwards. We have generated the first Hf isotopic data on basalts in this large igneous province along with bulk-rock trace-element abundance patterns and Sr-Nd isotopic ratios to assess the hypothesized kinship with co-located rhyolites throughout the hotspot track. The isotopic compositions for all three elements span much of the compositional range observed in mantle-derived basalts worldwide. Varying between a high of +11.3 in parts of the CRB and a low of −8.3 in some of the late SRP basalts, the new εHfvalues are geographically controlled, similar to the shift first documented with Sr and Nd isotopes across the “0.706 Sr line,” which marks the boundary between thin- accreted young ocean lithosphere and arc terranes in the west to thick, old cratonized crust in the east. This observation shows that there is significant lithospheric control on the isotopic compositions of both basalts and rhyolites associated with the Yellowstone hotspot track.Modeling of assimilation and fractional crystallization (AFC) processes in seven basaltic lava flows filling the 2-Ma Big Bend Ridge Caldera at Mesa Falls, Idaho, near the eastern end of the hotspot track suggests that the crustal contribution to the Nd and Hf concentration budgets increases systematically with time and was significant. A comparison of new and previously published bulk-rock major-oxide concentrations (e.g., the alkalis Na2O and K2O) with our previously published data for H2O, Cl, F and S in olivine-hosted melt inclusions suggests that the volatiles are sub-crustal, possibly from the lithospheric mantle, and degas extensively during magma ascent and crystallization.
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影响因子：
--
作者：
B. Jordan;A. Grunder;R. Duncan;A. Deino
通讯作者：
B. Jordan;A. Grunder;R. Duncan;A. Deino
DOI：
10.1016/j.jvolgeores.2009.01.034
发表时间：
2009-11
影响因子：
2.9
作者：
W. Leeman;D. Schutt;S. Hughes
通讯作者：
W. Leeman;D. Schutt;S. Hughes
俄勒冈州、华盛顿州和爱达荷州中生代花岗岩的 Rb-Sr 和 K-Ar 测年法及其 Sr 同位素组成
DOI：
--
发表时间：
1977
期刊：
影响因子：
--
作者：
R. Armstrong;W. H. Taubeneck;Peter O. Hales
通讯作者：
Peter O. Hales
黄石热点轨迹的火山口生命周期：Heise 火山口的死亡与重生
影响因子：
3.9
作者：
M. Jean;E. H. Christiansen;D. Champion;S. Vetter;W. Phillips;S. Schuth;J. Shervais
通讯作者：
J. Shervais
非造山流纹岩的岩石成因和火山学：比尔·邦尼克森 (Bill Bonnichsen) 特刊
影响因子：
3.5
作者：
M. McCurry;E. H. Christiansen;W. Leeman
通讯作者：
W. Leeman