Interspinifex Ni sulfide ore from Victor South-McLeay, Kambalda, Western Australia
Interspinifex Ni sulfide ore from Victor South-McLeay, Kambalda, Western Australia
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Interspinifex 镍硫化物矿石，产自西澳大利亚坎巴尔达 Victor South-McLeay
DOI：
10.1007/s00126-020-00982-w
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发表时间：
2021
影响因子：
4.8
通讯作者：
Barnes
中科院分区：
文献类型：
--
作者：
Staude;Barnes
在含科马铁矿的硫化物矿床中，含刺状结构的橄榄石板通常被称为“间刺状矿石”。该矿石类型罕见，但为硫化物矿床、科马铁矿火山学和热机械侵蚀过程提供了重要的成因信息。Victor South- mcleay和Moran South（西澳大利亚Kambalda）的产状与以前报道的产状在地层位置、矿石剖面位置和结构外观上有很大不同。因此，它们的形成过程必须重新考虑。此处报道的Interspinifex矿石位于基底熔岩流的下部，位于岩包中心块状和网状硫化物之间，以及块状硫化物和较老的玄武岩之间的“针尖”处，其中硫化物侧向融化成岩包边缘较老的玄武岩。Interspinifex矿石在块状硫化物的上部由长达10厘米的平行板的集合体组成，并被贫瘠的科马铁矿覆盖。它的质地不允许一个经典的单一解释。因此，设想了两种可能的形成机制：(1)较年轻的科马地岩熔体侵入其自身的橄榄石和硫化物液体堆积堆，而硫化物仍为液体。在硫化物顶部的注入导致乳剂的形成，由于熔体之间的温度梯度，从乳剂中形成刺状物。(2) Interspinifex矿石是早期科马铁矿流的遗迹，形成于科马铁矿与硫化物液体的一系列连续脉冲中。科马铁矿的刺状岩被一批较年轻的硫化物液体侵入，这些硫化物液体取代了间隙硅酸盐熔体。
Spinifex-textured olivine plates hosted in sulfides are usually named “interspinifex ore” in komatiite-hosted sulfide deposits. This ore type is rare but provides important genetic information on sulfide deposits, komatiite volcanology and thermomechanical erosion processes. Occurrences in Victor South-McLeay and Moran South (Kambalda, Western Australia) differ significantly from previously reported occurrences in their stratigraphic location, position within the ore profile and textural appearance. Thus, their formation process has to be reconsidered. Interspinifex ore reported here is situated in the lower portion of the basal lava flow between massive and net-textured sulfides in the centre of the embayment and between massive sulfides and older basalt in a “pinchout” where the sulfides melted sideways into older basalt on the embayment edge. Interspinifex ore is composed of up to 10-cm-long aggregates of parallel plates in the upper portion of massive sulfides and is overlain by barren komatiite. The texture does not allow for a classic single explanation. Thus, two possible formation mechanisms are envisaged: (1) A younger komatiite melt intrudes into its own olivine and sulfide liquid cumulate pile, while the sulfides are still liquid. The injection on top of the sulfides causes the formation of an emulsion, from which the spinifex forms due to the temperature gradient between the melts. (2) Interspinifex ore is a relic of an early komatiite flow formed in a series of successive pulses of komatiite and sulfide liquid. The spinifex of the komatiite is invaded by a younger batch of sulfide liquid replacing interstitial silicate melt.
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影响因子：
5.8
作者：
S. Barnes;S. Beresford;M. Vaillant
通讯作者：
S. Barnes;S. Beresford;M. Vaillant
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DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
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通讯作者：
M. Vaillant
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影响因子：
3.1
作者：
W. Stone;N. Archibald
通讯作者：
N. Archibald
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影响因子：
4.8
作者：
M. Houlé;C. Lesher;C. Lesher;P. C. Davis
通讯作者：
P. C. Davis
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影响因子：
64.8
作者：
N. Arndt
通讯作者：
N. Arndt