WebThe zoning shown in Fig. 8d also illustrates the mixtures of zoning types: oscillatory and complex zoning with sector zoning in some of the late-formed crystals. The X Fe values are shown in Fig. 8e and the complete EPMA data in Table 2. Sector zoning refers to a compositional difference between coeval growth sectors in a crystal. WebJun 1, 1993 · Compositional zoning, that shows a decrease of Mn content outward from the core to the margin (referred to as normal zoning) has been interpreted as the result of fractional crys- tallization (Hollister, 1966; Atherton, 1968) or more rigorously as the result of fractional crystalli- zation under changing physical conditions (Kretz, 1973; Loomis ...
Compositional zoning of fluid inclusions in the Archaean …
WebDec 1, 1989 · Sector zoning refers to a compositional difference between coeval growth sectors in a crystal and results from differences in fluid-crystal element partitioning between nonequivalent faces of the crystal. Sector zoning involving the trace elements Mg, Mn, Fe, and Sr is common in natural calcite cements, and sector zoning of Mn has been induced ... my book essentials update
Compositional Structure of Siderite Cement: Evidence of …
WebMaking Crystal Archives. As magmas crystallise, growing minerals respond to melt compositions and magmatic conditions via their textural characteristics, chemistry and style of compositional zoning ().Large crystals have traditionally been considered to grow in a tree-ring fashion, with concentric zones forming sequentially from core to rim, and … WebJan 10, 2024 · In comparison to other hydrous phases in subduction systems, relatively little is known about compositional variations and zoning of lawsonite because it has been … WebAn electron microprobe study of sector-zoning in clinopyroxenes from the Narce area, Italy shows that the relative order of enrichment of the pyroxene components with trivalent or quadrivalent cations in the M1 sites in the four crystallographically distinct sectors, (100), (110), (010), (1 11), is (100)>(110)>(010)>(1 11). For the crystal showing the largest … my book essentials wd