Copyright remains with the author s or their institution s. Permission for reuse free in most cases can be obtained from RightsLink. However, despite previous study, the formation and evolution of this deposit remains a key unknown in the tectonic evolution of the Eastern Kunlun Orogenic Belt. Moreover, the petrogenesis of the ore-bearing rocks and the nature of ore genesis are the subjects of ongoing debate. Here, we present detailed field observations, petrology, zircon U—Pb geochronology, and Re—Os isotopic analyses to constrain the timing and genesis of the Xiarihamu Cu—Ni sulfide deposit. Four samples from the ore-bearing Xiarihamu mafic—ultramafic intrusions yielded zircon U—Pb ages of In combination with previous research, drill core observations and Re—Os data provide robust evidence for multiple pulses of magma replenishment throughout the process of ore genesis.
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Author contributions: F. The causal mechanisms of global glaciations are poorly understood. The transition to a Neoproterozoic Snowball Earth after more than 1 Gy without glaciation represents the most dramatic episode of climate change in the geological record. Additionally, we present an original method to track tectonic influences on these climatic perturbations with a high-resolution coupled Os-Sr isotope curve across the transition from an ice-free world to a Neoproterozoic Snowball Earth.
The data indicate that increases in mantle-derived, juvenile material emplaced onto continents and subsequently weathered into the oceans led to enhanced consumption and sequestration of CO 2 into sediments. After nearly a billion years with no evidence for glaciation, ice advanced to equatorial latitudes at least twice between and Mya. Although the initiation mechanism of these Neoproterozoic Snowball Earth events has remained a mystery, the broad synchronicity of rifting of the supercontinent Rodinia, the emplacement of large igneous provinces at low latitude, and the onset of the Sturtian glaciation has suggested a tectonic forcing.
We present unique Re-Os geochronology and high-resolution Os and Sr isotope profiles bracketing Sturtian-age glacial deposits of the Rapitan Group in northwest Canada. Coupled with existing U-Pb dates, the postglacial Re-Os date of The Os and Sr isotope data allow us to assess the relative weathering input of old radiogenic crust and more juvenile, mantle-derived substrate.
The preglacial isotopic signals are consistent with an enhanced contribution of juvenile material to the oceans and glacial initiation through enhanced global weatherability. In contrast, postglacial strata feature radiogenic Os and Sr isotope compositions indicative of extensive glacial scouring of the continents and intense silicate weathering in a post—Snowball Earth hothouse.
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Re-Os. Radiogenic Isotope Dating Methods and Applications. Over the years, Chemostrat has expanded the services on offer to now include more advanced.
In order to resolve the controls on the distribution of these elements, chemical and isotope mapping of MoS 2 grains from representative porphyry copper-molybdenum deposits were performed using electron microprobe and nano-scale secondary ion mass spectrometry.
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Dating of lead-zinc deposits is of critical importance for better understanding of ore genesis, but has long been a big challenge due to the lack of suitable minerals that can be unequivocally linked to the ore genesis and that can be used for tradition radiometric methods. This kind of deposits have simple mineralogy dominated by galena and sphalerite commonly associated with calcite and other gangue minerals.
Both galena and sphalerite have low and high variable Re concentrations and thus Re-Os dating of these minerals have been less promising. In addition, the recovery of Re is extremely low for galena when conventional method was applied, lending additional difficulty in precisely dating galena.
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Dissecting the Re-Os molybdenite geochronometer
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Conventional dating of molybdenite Re- Os provides one of few options for direct dating of sulfide mineralization. Unfortunately, in situ dating of molybdenite is considered unreliable due to intra-granular decoupling of Re- Os. In this study, we developed a new analytical protocol for studies of micron- to grain scale Re- Os systematics in molybdenite. Several reaction gases were evaluated, and production of OsCH 2 by reaction with CH 4 was found to produce strong separation of Os from Re.
However, in contrast to the e. A mathematical correction of this remaining interference is possible, and Re- Os mass-shifted can be measured accurately even for fairly extreme ratios. For laser ablation, standards were developed by pressing particulate pellets of conventionally dated molybdenite Moly Hill and Merlin , because there are no appropriate reference materials available. Two important implications of this result are that decoupling Re-Os is not universal, and that our new analytical protocol is useful both for dating and for studies of decoupling.
However, dating of molybdenite is hindered by several analytical complications and is only performed in highly specialized labs. The main problem is that the mass difference between Re and Os cannot be resolved by mass spectrometry, and chemical separation of these isotopes is comparatively difficult.