1973USGS professional paperOpen access

Crystallization history of lunar feldspathic basalt 14310

Odette B. James

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Abstract

Locally developed fine-scale textures -----------Orthopyroxene with preserved euhedral faces Composite grains with orthopyroxene cores and pigeonite rims --------------------Coarse polysynthetically twinned pigeonite __ Ni-Fe, schreibersite, and troiHte ---------Phase compositions -------------------------------Plagioclase -__ ---__ ----_ ---------------------Subhedral laths -------------------------Grains enclosing metal-schreibersite-troilite inclusions ________________ --__ ---------Laths adjacent to vugs -------------------Laths in fine-grained clots ----------------Orthopyroxene ------------------------------Orthopyroxene with preserved euhedral crystal faces ------,------------------------Orthopyroxene adjacent to vugs -----------Orthopyroxene containing blebs and { 100} lamellae of augite ---------------------Orthopyroxene formed by inversion of pigeonite ------

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Locally developed fine-scale textures -----------Orthopyroxene with preserved euhedral faces Composite grains with orthopyroxene cores and pigeonite rims --------------------Coarse polysynthetically twinned pigeonite __ Ni-Fe, schreibersite, and troiHte ---------Phase compositions -------------------------------Plagioclase -__ ---__ ----_ ---------------------Subhedral laths -------------------------Grains enclosing metal-schreibersite-troilite inclusions ________________ --__ ---------Laths adjacent to vugs -------------------Laths in fine-grained clots ----------------Orthopyroxene ------------------------------Orthopyroxene with preserved euhedral crystal faces ------,------------------------Orthopyroxene adjacent to vugs -----------Orthopyroxene containing blebs and { 100} lamellae of augite ---------------------Orthopyroxene formed by inversion of pigeonite ------

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Locally developed fine-scale textures -----------Orthopyroxene with preserved euhedral faces Composite grains with orthopyroxene cores and pigeonite rims --------------------Coarse polysynthetically twinned pigeonite __ Ni-Fe, schreibersite, and troiHte ---------Phase compositions -------------------------------Plagioclase -__ ---__ ----_ ---------------------Subhedral laths -------------------------Grains enclosing metal-schreibersite-troilite inclusions ________________ --__ ---------Laths adjacent to vugs -------------------Laths in fine-grained clots ----------------Orthopyroxene ------------------------------Orthopyroxene with preserved euhedral crystal faces ------,------------------------Orthopyroxene adjacent to vugs -----------Orthopyroxene containing blebs and { 100} lamellae of augite ---------------------Orthopyroxene formed by inversion of pigeonite ------

Key concepts: Basalt, Crystallization, Astrobiology, Geology, Geochemistry, Fractional crystallization (geology), Earth science, Chemistry

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