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Minerals

Minerals

Minerals are essential nutrients that the human body needs in small amounts to work properly. They play a vital role in many bodily functions, such as building strong bones and transmitting nerve impulses. Some minerals are needed for hormone production or to maintain a normal heartbeat. Major minerals include calcium, phosphorus, potassium, sulfur, sodium, chlorine, and magnesium, while trace minerals include iron, manganese, copper, iodine, zinc, cobalt, fluoride, and selenium.

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Sediment Core Extrusion Method at Millimeter Resolution Using a Calibrated, Threaded-rod

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Dissecting the Re-Os molybdenite geochronometer.

Fernando Barra¹, Artur Deditius², Martin Reich³

¹Department of Geology and Andean Geothermal Center of Excellence (CEGA), FCFM, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile. fbarrapantoja@ing.uchile.cl.

Scientific Reports

|November 24, 2017

Summary

Rhenium (Re) and osmium (Os) isotopes in molybdenite (MoS2) are heterogeneously distributed, challenging precise age dating. These elements are bound within or near molybdenite, complicating geochronological interpretations.

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Atom Probe Tomography Analysis of Exsolved Mineral Phases

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Published on: October 25, 2019

Area of Science:

Geochemistry
Isotope Geology
Economic Geology

Background:

Molybdenite (MoS2) is a key mineral for rhenium (Re) and osmium (Os) isotope geochronology, crucial for dating ore deposits.
Accurate Re-Os dating relies on understanding the distribution of parent 187Re and daughter 187Os isotopes within molybdenite.
Previous assumptions about Re-Os isotope decoupling in molybdenite may hinder accurate mineralization age interpretations.

Purpose of the Study:

To investigate the distribution and controls on Rhenium (Re) and Osmium (Os) isotopes within molybdenite (MoS2).
To resolve discrepancies in Re-Os geochronology by examining element distribution at the micro and nano-scale.
To assess the impact of heterogeneous Re-Os distribution on the reliability of molybdenite dating methods.

Main Methods:

Chemical and isotope mapping of molybdenite (MoS2) grains using electron microprobe analysis (EMPA).
Nano-scale secondary ion mass spectrometry (NanoSIMS) for high-resolution isotopic and elemental imaging.
Analysis of molybdenite samples from representative porphyry copper-molybdenum deposits.

Main Results:

Demonstrated a heterogeneous distribution of Re (185,187Re) and Os (192Os) isotopes within molybdenite (MoS2) grains.
Showed that 187Re and 187Os isotopes are not decoupled as previously assumed, indicating a complex incorporation history.
Identified Re and Os as structurally bound or present as nanoparticles within or adjacent to molybdenite.

Conclusions:

The heterogeneous distribution and binding of Re and Os complicate microbeam dating of molybdenite (MoS2).
The observed 'nugget effect' of isotopes challenges the direct application of traditional Re-Os dating techniques.
Future geochronological studies must account for isotopic heterogeneity and element partitioning in molybdenite.