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2111 biopyribole intermediate between pyroxene and amphibole: Artifact or natural product?
-
Hiromi Konishi
,
Reijo Alviola
Published/Copyright:
March 28, 2015
Abstract
The 2111 pyribole chain sequence, where 2 signifies a double (amphibole-like) chain and 1 indicates a single (pyroxene-like) chain, has been reported from geological samples. Such material is commonly associated with slabs that contain multiples of three single chains, which we shall call “3n single-chain slabs” (where n = 1, 2, 3,…). We generated 2111 chain sequences and associated 3n single-chain slabs by heating natural chesterite crystals at ca. 1000 ºC in the laboratory as well as by their prolonged irradiation inside a 200 kV transmission electron microscope. Many of the synthesized 2111 sequences are intergrown with narrow regions containing isolated single- and double-chain material that contains, respectively, 3n single chains and n double chains. The single-chain triplets presumably formed as a result of the decomposition of isolated triple-chain slabs that were originally intergrown with the chesterite. The 2111 sequence and the 3n single-chain slabs can form, respectively, by decomposition of chesterite and triple-chain material during observation or perhaps during ion milling. Recognizing such artifacts is important when attempting to interpret geological history from the details of biopyribole structures and intergrowths.
Received: 2002-9-5
Accepted: 2003-7-22
Published Online: 2015-3-28
Published in Print: 2004-1-1
© 2015 by Walter de Gruyter Berlin/Boston
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- Coexisting chromian omphacite and diopside in tremolite schist from the Chugoku Mountains, SW Japan: The effect of Cr on the omphacite-diopside immiscibility gap
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