Nd-, Sr-, O-isotopic and chemical evidence for a two-stage contamination history of mantle magma in the Central-Alpine Bergell intrusion

Article Abstract:

Isotopic and geochemical analyses had determined the elements contributing to the formation of the Bergell igneous intrusion complex in the Swiss Alps. Material contamination results from isotopic readings revealed the events leading to the development of the intrusion. Factors such as mantle melting, oceanic crust dehydration or partial melting and magma uprising caused the contamination of the intrusion with rare earth and trace elements. Furthermore, the source contamination was responsible for the unusual isotopic array displacement from the mantle towards the radiogenic Bergell intrusion.

Usage, Oxygen, Isotopes, Oxygen isotopes, Neodymium, Radioisotopes, Geology, Strontium, Radioisotopes in geology

---

Moderate pressure metamorphism and anatexis due to anorthosite intrusion, western Adirondack Highlands, New York

Article Abstract:

A study of western Adirondack Highlands, New York, shows the presence of minerals formed by moderate pressure metamorphism and anatexis from anorthosite intrusion. The monazite age indicates the occurrence of high temperature metamorphism for 1040-960 Ma. The zircon ages and metapelite's textural relations indicate anatexis for 1150 Ma. The presence of nelsonite indicates anorthosite intrusion during partial melting in the gneiss.

Metamorphism (Geology)

---

Fe-rich tholeiitic liquids and their cumulate products in the Pleasant Bay layered intrusion, coastal Maine

Article Abstract:

FE-rich tholeiitic liquids are preserved as a chilled base of the macrorhythmic layer in the Pleasant Bay mafic-silicic layered intrusion. Olivine and plagioclase compositions indicated that they are end stage liquids formed by tholeiitic basalt fractionation. The mineral assemblage of the chilled rocks suggest conditions of crystallization at temperatures of around 950 degrees C.

Mineralogical research

Similar abstracts:

• Abstracts: Neodymium isotopic evidence for the tectonic assembly of late Archean crust in the Slave Province, northwest Canada
• Abstracts: New constraints on the age of the Manaslu leucogranite: evidence for episodic tectonic denudation in the central Himalaya: comment and reply
• Abstracts: Diamond percipitation and mantle metasomatism - evidence from the trace element chemistry of silicate inclusions in diamonds from Akwatia, Ghana
• Abstracts: Auditory tuning and call frequency predict population-based mating preferences in the cricket frog, Acris crepitans
• Abstracts: Behavior of isotopic systematics during deformation and metamorphism: a Hf, Nd and Sr isotopic study of mylonitized granite

This website is not affiliated with document authors or copyright owners. This page is provided for informational purposes only. Unintentional errors are possible.