Digital Bedrock Geology Compilation of the Central Sierra Nevada, Eastern California

We present a preliminary digital compilation of central Sierra Nevada (CSN) bedrock geology. This data-rich, GIS-based compilation of map, field, lithology, structure, geochronology, and geochemistry datasets spans 13,000 sq. km and includes 10,000s of structural measurements, over 50 years of new and published mapping, 100s of geochronology sample analyses, and 1000s of geochemical analyses. The data model underpinning this compilation emphasizes that geologic maps are abstractions, rather than direct representations, of map data and other geologic observables. A relational database scheme, including spatial relationships between point, line, and polygon data, enables information to be passed across and amongst datasets.

Such syntheses of multi-disciplinary geologic observables represent significant opportunities for: (a) seed data for community cyberinfrastructure and repository initiatives; (b) consideration and communication of field geology data models and criteria through creating and sharing data schemes; (c) disseminating geologic studies, concepts, data, products, and interpretations with the general public, government agencies, funding organizations, and earth science domain specialists; (d) enabling more complete and thorough data visualization, exploitation, and analysis; and (e) new applications of statistical and spatial analyses to best leverage such large synthesized databases.

This effort focuses on the CSN as a well-studied, preserved Cordilleran orogen and imbedded arc with great potential as a 'field laboratory' for future studies in continental tectonics as well as other disciplines. Ongoing applications of this compilation include: synthesis of structural, map, and geochronologic data to characterize heterogeneous structural development within hot orogens; testing numerical model predictions of multi-scale deformation partitioning; estimates of magmatic addition and volcanic eruption rates preserved in the rock record; defining spatiotemporal patterns and scales of arc and orogenic processes; new interpretations of CSN tectonostratigraphic relationship; and creating updated geologic maps of key CSN areas. We are particularly excited to consider new challenges and opportunities in exploiting and analyzing geologic databases of this scale.