As the most robust accessory mineral, both physically and chemically, zircon can preserve valuable geochemical information of the melt that it crystallized from, which makes it an extremely powerful tool to investigate the nature of the first 500 Ma of Earth’s history. Zircon is…
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This study investigates the photoluminescence (PL), cathodoluminescence (CL), radioluminescence (RL) and ionoluminescence (IL) of natural and synthetic minerals. The natural minerals (fluorapatite, leucophanite, meliphanite and zircon) are mostly from Ilímaussaq Alkaline Complex…
The Neoproterozoic Era (1000-544 Ma) was a time of global climate change, hypothesized to range from snowball Earth to a greenhouse climate. Two contrasting models such as the Snowball Earth Hypothesis and the Zipper-Rift model compete to explain such climatic oscillations. The …
Northwest Africa provides unique insight into a wide range of geologic processes throughout a vast portion of Earth's history. Moroccan geology in particular can provide valuable insight, from the formations of West Africa through the Eburnian orogeny (~2000 Ma), Gondwana during…
Zircon data from South Karakoram gneiss dome provide evidence for Proterozoic inherited cores (1.8-1.9 Ga and 2.3-.2.5 Ga) surrounded by migmatitic overgrowth with ages ranging from ∼6 to ∼20Ma. Oxygen isotopic data of Neogene migmatite and inherited core is similar and indistin…
The ∼74 ka eruption of the Youngest Toba Tuff in Sumatra, Indonesia, was one of the largest single volcanic eruptions in geologic history. The compositional and thermal evolution of the magma reservoir prior to eruption was investigated through spatially-sensitive analyses of th…
How quickly huge volumes of magma accumulate and evolve beneath caldera volcanoes and whether they are stored for long periods before eruption are fundamental to understanding the potential for destructive volcanic eruptions, how voluminous magmas differentiate, and how vast tra…
The Mesoproterozoic (1.4–0.9 Ga) Grenville Orogeny led to the formation of the supercontinent Rodinia. One unique characteristic of the Grenville Orogeny is that it produced a volumetrically significant amount of zirconium- (Zr) enriched granitoids, evidently more than any perio…
The Great Unconformity beneath Paleozoic strata represents 100-1000 m.y. of missing rock record that formed through extensive weathering and erosion. Despite its global extent, the timing of Precambrian crystalline rock exhumation prior to Phanerozoic sediment deposition remains…