Microdiamond in a low-grade metapelite from a Cretaceous
2020年7月15日 · Here we report the discovery of microdiamond aggregates in the matrix of a metapelite from the Nishisonogi unit, Nagasaki Metamorphic Complex, western Kyushu, Japan.
Retrograde alterations of phyllosilicates in low-grade metapelite…
2012年8月2日 · The three different cases coincide in terms of: (1) geological context—diagenetic to low-grade metamorphic alteration of pelitic and psammitic materials; (2) XRPD …
8.6.1: Metamorphosed Pelitic Rocks (Metapelites)
2022年8月28日 · At low grade this leads to the formation of chlorite and muscovite. At higher grade, biotite forms. Foliated textures develop as muscovite and biotite crystallize, so …
Chlorite is a common sheet silicate that occurs in various lithologies over a wide grade range involving diagenesis and low-grade metamorphism. Thus, the reaction progress of chlorite …
(PDF) Metamorphism of Pelitic (Al-Rich) Rocks - ResearchGate
2020年1月1日 · Contact metamorphism of pelites adjacent to igneous intrusions produces low-pressure mineral assemblages commonly with the index minerals biotite, andalusite, …
Textural-compositional evolution of pyrite and metal …
2024年3月1日 · The metapelite, host rock of orogenic Au mineralization in the LUC, has been metamorphosed to low-grade with conditions of 300 < T < 550 °C and 400 < P < 1200 MPa, …
FIG. 1. P–T pseudosection for an aluminous metapelite with a...
Low-to medium-grade metapelites have been, instead, generally treated as dominated by H 2 O-saturated conditions, because aqueous fluids are generally produced through prograde …
grade metamorphism of pelitic sediments starts with rocks at a maximum hydrated state. This is often not the case in other rock compositions (e. g., ul tramafic and mafic rocks). Shales …
Phase equilibria modeling of anatexis during ultra-high …
2021年10月1日 · For the metapelite, five MLEs produce six pseudosection panels along the isobaric heating path at 0.8 GPa, as shown in Fig. 3 a. The lowest-temperature panel matches …
Trace Element (Mn‐Sr‐Y‐Th‐REE) and U‐Pb Isotope Systematics of ...
2019年7月30日 · The very low REE abundances and extremely low Th and U contents in low-grade metamorphic apatite are frequently attributed to REE, Th, and U uptake by accessory …