Moganite in the Chalcedony Varieties of Continental Cherts (Miocene, Madrid Basin, Spain)



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Bustillo Revuelta, María Ángeles and Pérez Jiménez, José Luis and Alonso-Zarza, Ana María and Furió Vega, Marta (2012) Moganite in the Chalcedony Varieties of Continental Cherts (Miocene, Madrid Basin, Spain). Spectroscopy letters, 45 (2). pp. 109-113. ISSN 0038-7010

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Varieties of chalcedony (calcedonite, quartzine, and lutecite) and other optical micro- and cryptocrystalline textures of quartz and opal from Miocene silcretes of the Madrid Basin were studied using a Thermo Fisher DXR Raman microscope. The microscope has a point-and-shoot Raman capability of 1 µm spatial resolution and was coupled with a standard optical microscope. Our results show that all the varieties of chalcedony can have a composite Raman spectrum of both quartz and moganite. The spectra are independent of the chalcedony origin by ageing, direct replacement, and cementation processes. Moganite was absent only in some calcedonite cements. The presence of moganite is independent of the surface sedimentary setting of the host rocks in which the silcretes are formed.

Item Type:Article
Uncontrolled Keywords:Chalcedony, moganite, silcretes, chert, Micro-Raman.
Subjects:Sciences > Geology > Mineralogy
ID Code:68703
Deposited On:12 Nov 2021 06:45
Last Modified:15 Nov 2021 11:18

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