[Eoas-seminar] EOAS Colloquium 25th April, 3pm, ONLINE - Dr. Wei Mao and Dr. Zhenhao Zhou

Fri Apr 25 14:40:44 EDT 2025

A final reminder of our colloquium at 3pm TODAY!

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Topic: EOAS Seminar 25th April
Time: Apr 25, 2025 03:00 PM Eastern Time (US and Canada)
https://fsu.zoom.us/j/92494726981<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Ffsu.zoom.us%2Fj%2F92494726981&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7C1472983494be459e85ee08dd8428b073%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C638812032470550211%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=S4yQoQus2tQLJxtqer9nuRWSGIH3eyIKLxiwvqHhWds%3D&reserved=0>
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It is our last one of the semester - please show up to support our postdocs!

________________________________
From: Eoas-seminar <eoas-seminar-bounces at lists.fsu.edu> on behalf of eoas-seminar--- via Eoas-seminar <eoas-seminar at lists.fsu.edu>
Sent: Friday, April 25, 2025 10:48 AM
To: eoas-seminar at lists.fsu.edu <eoas-seminar at lists.fsu.edu>
Subject: [Eoas-seminar] EOAS Colloquium 25th April, 3pm, ONLINE - Dr. Wei Mao and Dr. Zhenhao Zhou

A reminder of our (online) colloquium this afternoon!

________________________________
From: Eoas-seminar <eoas-seminar-bounces at lists.fsu.edu> on behalf of eoas-seminar--- via Eoas-seminar <eoas-seminar at lists.fsu.edu>
Sent: Wednesday, April 23, 2025 3:43 PM
To: eoas-seminar at lists.fsu.edu <eoas-seminar at lists.fsu.edu>
Subject: [Eoas-seminar] EOAS Colloquium 25th April, 3pm, ONLINE - Dr. Wei Mao and Dr. Zhenhao Zhou

Dear all,

Please join us this Friday for the final colloquium of the semester, which will be held online and feature presentations from EOAS's own postdoctoral researchers Dr. Wei Mao and Dr. Zhenhao Zhou.

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Topic: EOAS Seminar 25th April
Time: Apr 25, 2025 03:00 PM Eastern Time (US and Canada)
https://fsu.zoom.us/j/92494726981

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The title and abstracts are given below.

It will be great to see a strong turnout for this one, so please encourage everyone to attend!

All the best,
Rhys

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Dr. Wei Mao

Title: ArcNLET-Py: Model Development and Its Application in Determining OSTDS Setback Distances

Abstract: In this presentation, I prepare to introduce ArcNLET-Py, a Python-based nutrient load estimation toolbox for ArcGIS Pro, developed by our team last year. ArcNLET-Py simulates the reactive transport of ammonium, nitrate, and phosphate from Onsite Sewage Treatment and Disposal Systems (OSTDS) to groundwater and subsequently surface water. In addition to model development, I applied ArcNLET-Py to simulate nitrogen attenuation from over 20,000 OSTDS across Florida, with a particular focus on simultaneously evaluating both vertical and horizontal setback distances. While previous studies have primarily emphasized horizontal setback distances, vertical distances have received limited attention. Our results provide new insights into the scientific basis for OSTDS setback regulations, contributing to more comprehensive and effective nitrogen management strategies

Dr. Zhenhao Zhou

Title: Ultra-High Temperature Metamorphism and its Tectonic Implications in the Deep Roots of the Sierra Nevada, California

Abstract: The Sierra Nevada Batholith (SNB) is a massive, ancient intrusive complex in California that represents the deep roots of long-lived Mesozoic arc magmatism. Previous barometry studies in the SNB have revealed a tilted crustal profile, with shallow exposures (~ 2 kbar) in the north and progressively deeper levels (> 8 kbar) toward the southern SNB. However, metamorphic pressure (P) and temperature (T) conditions of the widespread metasedimentary country rocks remain poorly constrained, limiting the reconstruction of the regional tectono-thermal history and, more broadly, our understanding of the fate of metamorphic CO₂ in arc settings.

In this study, we document distinctive petrologic evidence of granulite-facies metamorphism in a quartzite and an adjacent metapelite from the southern SNB. Quartz-in-garnet and zirconium-in-rutile thermobarometry applied to garnet-hosted lamellae in the quartzite indicate fairly deep and hot peak metamorphic conditions (> 12 kbar and > 800 °C). These estimates are further supported by peak temperatures of more than 900 °C calculated for the reintegrated composition of a rare anorthite-orthoclase antiperthite feldspar textures preserved in the adjacent metapelite. Thermodynamic modeling suggests that exhumation-driven re-equilibration occurred at approximately 4.5 kbar and 650 °C, with the temperature matching that inferred for antiperthite exsolution.

Together, these results constrain a P–T path involving peak granulite-facies metamorphism followed by > 30 km of exhumation. This study presents the first documented evidence of ultra-high temperature metamorphism in natural samples from the southern SNB, and the first thermobarometric reconstruction of a P–T path in this portion of the arc. These findings provide important new insights into the deep crustal evolution of the Sierran arc and offer a framework for understanding the thermal regimes that may influence processes such as metamorphic decarbonation.

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