Madeline J. Lewis

Madeline J. Lewis
Purdue University | Purdue · Department of Earth and Atmospheric Sciences

Postdoc Purdue Unviversity

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6
Publications
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6
Citations

Publications

Publications (6)
Article
Full-text available
Although the voluminous granitoids that constitute the upper crust of the Sierra Nevada batholith (California) have been investigated in detail, comparatively few studies focus on the origin of mafic bodies at similar crustal levels. Here, we present field and petrographic observations, geochronology, and geochemistry of the Hidden Lakes mafic comp...
Conference Paper
Full-text available
It is widely recognized that magma flux in continental arcs is cyclic in nature, resulting in “flare-ups” and lulls, but the cause of these arc tempos is uncertain. Variable subduction angle and convergence rate, lithospheric underthrusting, and fluctuating mantle input are invoked to explain these cycles. Though the upper crust of continental arcs...
Article
Full-text available
We present results from a well‐dated sediment core on the Pacific‐Antarctic Ridge (PAR) that document a ∼15 cm thick layer of basaltic ash shards that leads the penultimate deglaciation (Termination 2). The glasses have MORB composition consistent with an axial source and their morphologies are typical of pyroclastic deposits created by submarine v...
Conference Paper
Banded iron formations (BIFs) are sedimentary rocks composed mainly of silica and iron-bearing minerals formed from the accumulation of Si and Fe in anoxic environments sustained in Archean-Paleoproterozoic and isolated Neoproterozic oceans. The Fe and Si sources are recognized to have been a combination of hydrothermal, seawater, and detrital inpu...
Conference Paper
Magmatic differentiation in arc settings is likely a polybaric process, with crystallization of primitive basalts occurring primarily in the lower crust and more evolved melts in the upper crust. The general lack of mafic-ultramafic cumulates in the silicic paleo-arc upper crust supports this model. However, the Sierra Nevada Batholith preserves nu...

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