GSA Today最新文献_第5页

Virtual Outcrops in a Pocket: The Smartphone as a Fully Equipped Photogrammetric Data Acquisition Tool 口袋里的虚拟露头:智能手机作为一个装备齐全的摄影测量数据采集工具

GSA Today Pub Date : 2021-06-08 DOI: 10.1130/gsatg506a.1

A. Corradetti, T. Seers, A. Billi, S. Tavani

引用次数: 7

Recruiting to Geosciences through Campus Partnerships 通过校园合作招聘地球科学

GSA Today Pub Date : 2021-06-01 DOI: 10.1130/GSATG503GW.1

C. Cervato

引用次数: 0

Curation and Analysis of Global Sedimentary Geochemical Data to Inform Earth History 全球沉积地球化学数据的整理与分析为地球历史提供信息

GSA Today Pub Date : 2021-03-24 DOI: 10.1130/GSATG484A.1

Akshay Mehra, C. B. Keller, Tianran Zhang, N. Tosca, S. McLennan, E. Sperling, Una C Farrell, J. Brocks, D. Canfield, D. Cole, P. Crockford, Huan Cui, T. Dahl, K. Dewing, J. Emmings, R. Gaines, T. Gibson, G. Gilleaudeau, R. Guilbaud, Malcolm Hodgkiss, A. Jarrett, P. Kabanov, M. Kunzmann, Chao Li, D. K. Loydell, Xinze Lu, Austin J Miller, N. Mills, L. Mouro, Brennan O’Connell, S. Peters, S. Poulton, S. Ritzer, Emmy Smith, P. Wilby, C. Woltz, J. Strauss

引用次数: 9

Bringing the Field to Students during COVID-19 and Beyond 在2019冠状病毒病期间及以后为学生带来实地考察

GSA Today Pub Date : 2021-03-01 DOI: 10.1130/gsatg478gw.1

L. Arthurs

引用次数: 10

Geology in an Online World 在线世界中的地质学

GSA Today Pub Date : 2021-02-01 DOI: 10.1130/GSATPRSADRS20.1

J. Walker

引用次数: 3

ANALYSIS OF SKILLS SOUGHT BY EMPLOYERS OF BACHELORS-LEVEL GEOSCIENTISTS 雇主对学士级地球科学家的技能要求分析

GSA Today Pub Date : 2021-01-01 DOI: 10.1130/abs/2020am-359280

Gregory Shafer, Not Provided, K. Viskupic, A. Egger

{"title":"ANALYSIS OF SKILLS SOUGHT BY EMPLOYERS OF BACHELORS-LEVEL GEOSCIENTISTS","authors":"Gregory Shafer, Not Provided, K. Viskupic, A. Egger","doi":"10.1130/abs/2020am-359280","DOIUrl":"https://doi.org/10.1130/abs/2020am-359280","url":null,"abstract":"INTRODUCTION Bachelors-level geoscientists make up the majority of the geoscience workforce, and positions for entry-level geoscientists are expected to grow rapidly over the next decade, with some jobs anticipating upward of 10% growth (National Center for O*NET Development, 2021). Are geoscience departments adequately preparing undergraduate students to succeed in these positions? Answering this question requires examining the alignment of undergraduate program outcomes and workforce needs. The results allow faculty to identify strengths and weaknesses in their programs with respect to workforce preparation (e.g., Viskupic et al., 2020). How well do we know workforce needs? Vision and Change in the Geosciences (Mosher and Keane, 2021) provides a list of competencies and skills necessary for new graduates to succeed in the workforce; the list was generated by academics (n ~200) and employers (n = 46) in a series of workshops. This list, while comprehensive and insightful, represents input from a relatively small sample of geoscience employers and may overrepresent the petroleum industry (26% of industry workshop participants), which has not been a significant employer of bachelorslevel geoscientists (Gonzales and Keane, 2021). Our goal was to characterize the skills sought by the full range of bachelorslevel geoscience employers and how these skills are communicated to potential applicants—with an eye toward providing information that would allow academic leaders to examine the alignment between their programs and workforce needs.","PeriodicalId":35784,"journal":{"name":"GSA Today","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"63651875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

The Mesoproterozoic Single-Lid Tectonic Episode: Prelude to Modern Plate Tectonics 中元古代单盖构造事件：现代板块构造的前奏

GSA Today Pub Date : 2020-12-01 DOI: 10.1130/gsatg480a.1

R. Stern

{"title":"The Mesoproterozoic Single-Lid Tectonic Episode: Prelude to Modern Plate Tectonics","authors":"R. Stern","doi":"10.1130/gsatg480a.1","DOIUrl":"https://doi.org/10.1130/gsatg480a.1","url":null,"abstract":"The hypothesis that the Mesoproterozoic (1600–1000 Ma) tectonic regime was a protracted single-lid episode is explored. Singlelid tectonic regimes contrast with plate tectonics because the silicate planet or moon is encased in a single lithospheric shell, not a global plate mosaic. Single-lid tectonics dominate among the Solar System’s active silicate bodies, and these show a wide range of magmatic and tectonic styles, including heat pipe (Io), vigorous (Venus), and sluggish (Mars). Both positive and negative evidence is used to evaluate the viability of the Mesoproterozoic single-lid hypothesis. Four lines of positive evidence are: (1) elevated thermal regime; (2, 3) abundance of unusual dry magmas such as A-type granites and anorthosites; and (4) paucity of new passive continental margins. Negative evidence is the lack of rock and mineral assemblages formed by plate-tectonic processes such as ophiolites, blueschists, and ultra high-pressure terranes. Younger platetectonic–related and Mesoproterozoic mineralization styles contrast greatly. Paleomagnetic evidence is equivocal but is permissive that Mesoproterozoic apparent polar wander paths of continental blocks did not differ significantly. These tests compel the conclusion that the Mesoproterozoic single-lid hypothesis is viable.","PeriodicalId":35784,"journal":{"name":"GSA Today","volume":" ","pages":"4-10"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43909440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 36

A Three-Dimensional, Virtual Tour of the Johnston Geology Museum 约翰斯顿地质博物馆三维虚拟之旅

GSA Today Pub Date : 2020-12-01 DOI: 10.1130/gsatg470gw.1

M. Schulmeister, Brian C. Edwards

引用次数: 1

It’s Time to Defuse the Cambrian “Explosion” 是时候挑战寒武纪的“大爆炸”了

GSA Today Pub Date : 2020-12-01 DOI: 10.1130/gsatg460gw.1

Jacob Beasecker, Zach Chamberlin, Nicole Lane, Katie W. Reynolds, Jack Stack, Kailey Wahrer, Abigail Wolff, Jo Devilbliss, Corey Wahr, Dan Durbin, Hannah Garneau, D. Brandt

引用次数: 5

Predicting the Water Balance from Optimization of Plant Productivity 从植物生产力优化预测水分平衡

GSA Today Pub Date : 2020-11-01 DOI: 10.1130/gsatg471gw.1

A. Hunt, B. Faybishenko, B. Ghanbarian

{"title":"Predicting the Water Balance from Optimization of Plant Productivity","authors":"A. Hunt, B. Faybishenko, B. Ghanbarian","doi":"10.1130/gsatg471gw.1","DOIUrl":"https://doi.org/10.1130/gsatg471gw.1","url":null,"abstract":"How soil-water flows and how fast it moves solutes are important for plant growth and soil formation. The relationship describing the partitioning of precipitation, P, into run-off, Q, and evapotranspiration, ET, is called the water balance. Q incorporates both surface runoff and subsurface flow components, the latter chiefly contributing to soil formation. At shorter time intervals, soil-water storage, S, may change, dS/dt, due to atmosphere-soil water exchange; i.e., infiltrating and evaporating water and root uptake. Over sufficiently long time periods, storage changes are typically neglected (Gentine et al., 2012). Percolation theory from statistical physics provides a powerful tool for predicting soil formation and plant growth (Hunt, 2017) by means of modeling soil pore space as networks, rather than continua. In heterogeneous soils, solute migration typically exhibits non-Gaussian behavior, with statistical models having long tails in arrival time distributions and velocities decreasing over time. Theoretical prediction of solute transport via percolation theory that generates accurate full non-Gaussian arrival time distributions has become possible only recently (Hunt and Ghanbarian, 2016; Hunt and Sahimi, 2017). A unified framework, based on solute transport theory, helps predict soil depth as a function of age and infiltration rate (Yu and Hunt, 2017), soil erosion rates (Yu et al., 2019), chemical weathering (Yu and Hunt, 2018), and plant height and productivity as a function of time and transpiration rates (Hunt, 2017). Expressing soil depth and plant growth inputs to the crop net primary productivity, NPP, permits optimization of NPP with respect to the hydrologic fluxes (Hunt et al., 2020). Some remarkable conclusions also arise from this theory, such as that globally averaged ET is almost twice Q, and that the topology of the network guiding soil-water flow provides limitations on solute transport and chemical weathering. Both plant roots and infiltrating water tend to follow paths of least resistance, but with differing connectivity properties. Except in arid climates (Yang et al., 2016), roots tend to be restricted to the thin topsoil, so lateral root distributions are often considered twodimensional (2D), and root structures employ hierarchical, directional organization, speeding transport by avoiding closed loops. In contrast, infiltrating water (i.e., the subsurface part of Q) tends to follow random paths (Hunt, 2017) and percolates through the topsoil more deeply, giving rise to three-dimensional (3D) flow-path structures. The resulting distinct topologies generate differing nonlinear scaling, which is fractal, between time and distance of solute transport. On a bi-logarithmic space-time plot (Hunt, 2017), optimal paths for the different spatiotemporal scaling laws of root radial extent (RRE) and soil depth, z, are defined by their radial divergence from the same length and time positions. RRE relates to NPP, which is a key d","PeriodicalId":35784,"journal":{"name":"GSA Today","volume":"30 1","pages":"28-29"},"PeriodicalIF":0.0,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46142433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2