期刊
PRECAMBRIAN RESEARCH
卷 343, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.precamres.2020.105729
关键词
Komatiite; Kambalda; Pillow lava; Archaean; Lava viscosity; Lava morphology
资金
- German Research Foundation [407352165]
- Rice Academy Fellowship
Pillow lavas are an abundant morphological lava type both on Earth and on some extraterrestrial bodies. We examine pillows from Kambalda (Western Australia) komatiites, that uniquely preserve pillow necks, interpillow cavities, and internal crusts. Our study is the first description of true pillows from an Archaean high-MgO (similar to 31%) komatiite. Their size ranges from 0.5 to 5 cm and most have equal vertical and horizontal axes. Due to very low melt viscosities (similar to 0.01 - 0.1 Pa s), these komatiite pillows are one to two orders of magnitude smaller than modern basaltic counterparts. True high-MgO komatiites, such as those at Kambalda, require a low flow rate, potentially found on distal flow edges. Such low flow rates are in conflict with the high flow velocities generally assumed for komatiites, and hence explains the rarity of komatiite pillow lavas.
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