scholarly journals Fe–Ti(–V) Oxide Deposits of the Kunene Anorthosite Complex (SW Angola): Mineralogy and Thermo-Oxybarometry

Minerals ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 246 ◽  
Author(s):  
Cristina Villanova-de-Benavent ◽  
Lisard Torró ◽  
Montgarri Castillo-Oliver ◽  
Marc Campeny ◽  
Joan Carles Melgarejo ◽  
...  
Keyword(s):  
Anorthosite Complex

scholarly journals Response of the U–Pb chronometer and trace elements in zircon to ultrahigh-temperature metamorphism: The Kadavur anorthosite complex, southern India

2011 ◽  
Vol 290 (3-4) ◽  
pp. 177-188 ◽  
Author(s):  
Ellen Kooijman ◽  
Dewashish Upadhyay ◽  
Klaus Mezger ◽  
Michael M. Raith ◽  
Jasper Berndt ◽  
...  
Keyword(s):  
Trace Elements ◽  
Southern India ◽  
Ultrahigh Temperature ◽  
Anorthosite Complex

scholarly journals High-aluminum orthopyroxene megacrysts (HAOM) in the Ahvenisto complex, SE Finland, and the polybaric crystallization of massif-type anorthosites

2019 ◽  
Vol 175 (1) ◽  
Author(s):  
Aku Heinonen ◽  
Heli Kivisaari ◽  
Radoslaw M. Michallik
Keyword(s):  
Host Rock ◽  
Compositional Evolution ◽  
Al Content ◽  
Rock Types ◽  
Global Comparison ◽  
Different Types ◽  
Anorthosite Complex ◽  
High Aluminum

AbstractThe occurrence of high-aluminum orthopyroxene megacrysts (HAOMs) in several massif-type Proterozoic anorthosite complexes has been used as evidence of their polybaric crystallization. Here, we report such petrographic and geochemical (XRF and EMPA) evidence from HAOMs discovered in the 1.64 Ga Ahvenisto rapakivi granite—massif-type anorthosite complex in southeastern Finland. Two different types of HAOMs were recognized: type 1 HAOMs are individual, euhedral-to-subhedral crystals, and up to 15 cm in diameter, and type 2 HAOMs occur in pegmatitic pockets closely associated with megacrystic (up to 30 cm long) plagioclase. The type 1 megacrysts in particular are surrounded by complex corona structures composed of plagioclase, low-Al orthopyroxene, iddingsite (after olivine), and sulfides. Orthopyroxene crystallization pressure estimates based on an Al-in-Opx geobarometer reveal a three-stage compositional evolution in both textural HAOM types. The Al content decreases significantly from the core regions of the HAOM (4.4–7.6 wt% Al2O3), through the rims (1.3–3.6 wt%), into the host rock (0.5–1.5 wt%). Enstatite compositions overlap, but are generally higher in the cores (En~60–70) and rims (En~50–70) of the HAOMs than in the host rock (En~45–60) orthopyroxenes. The highest recorded Al abundances in the HAOM cores correspond to crystallization pressures of up to ~ 1.1 GPa (~ 34 km depth), whereas the HAOM rims have crystallized at lower pressures (max. ~ 0.5 GPa, 20 km depth). The highest pressure estimates for the host rock orthopyroxene were ~ 0.2 GPa (< 7 km depth). These observations confirm the polybaric magmatic evolution of the Ahvenisto anorthosites and suggest that the entire 1.65–1.55 Ga Fennoscandian rapakivi suite was emplaced at a relatively shallow level (< 7 km depth) in the upper crust. Global comparison to similar rock types reveals remarkable similarities in the petrogenetic processes controlling HAOM composition and evolution of anorthosite parental magmas.

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