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Title: Preperation of Codes for Trinity.


Abstract not provided.

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Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the Cray User Group Conference held April 26-30, 2015 in Chicago, Illinois.
Country of Publication:
United States

Citation Formats

Vaughan, Courtenay T., Rajan, Mahesh, Dinge, Dennis, Dohrmann, Clark R., Glass, Micheal W., Franko, Kenneth J., Pierson, Kendall H., and Tupek, Michael R.. Preperation of Codes for Trinity.. United States: N. p., 2015. Web.
Vaughan, Courtenay T., Rajan, Mahesh, Dinge, Dennis, Dohrmann, Clark R., Glass, Micheal W., Franko, Kenneth J., Pierson, Kendall H., & Tupek, Michael R.. Preperation of Codes for Trinity.. United States.
Vaughan, Courtenay T., Rajan, Mahesh, Dinge, Dennis, Dohrmann, Clark R., Glass, Micheal W., Franko, Kenneth J., Pierson, Kendall H., and Tupek, Michael R.. 2015. "Preperation of Codes for Trinity.". United States. doi:.
title = {Preperation of Codes for Trinity.},
author = {Vaughan, Courtenay T. and Rajan, Mahesh and Dinge, Dennis and Dohrmann, Clark R. and Glass, Micheal W. and Franko, Kenneth J. and Pierson, Kendall H. and Tupek, Michael R.},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2015,
month = 4

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  • Three ages of plagiogranites (PG) are reported from the Trinity Complex: late Proterozoic to earliest Cambrian (570 Ma), Ordovician (469--475 Ma), and Silurian (412 Ma). Minor Ordovician PG intrudes 570 Ma cumulate gabbros and is only moderately deformed. Silurian PG is related to voluminous gabbroic magmatism (Waling et al. 1981) and is relatively undeformed. However, 570 Ma PG in the Gregg Ranch area from Gazelle Mtn. to Lovers Leap is intensely deformed and is either part of the Trinity ophiolite sequence or blocks of Trinity ophiolite within melange of the Gregg Ranch Complex. The 570 Ma PG of Gregg Ranchmore » consists of light gray, medium-grained fresh PG, interleaved with darker finer-grained PG that contains abundant sulfides (pyrite, chalcopyrite). Both types are cataclastic: after ductile stretching, quartz (Q) and plagioclase (PL) grains were broken and rotated. Though surrounded by fine fragmental Q and PL matrix, some larger pieces fit back together. Thus, the PG experienced deformation under P-T conditions across the ductile to brittle transition. A change in fabric and joint orientations from NW to NE across the area suggests the rocks were subsequently folded at least once. The 570 Ma Trinity ophiolite was intensely deformed prior to intrusion of minor PG in the Ordovician. Silurian magmatism postdates all major deformation and records no later orogenic events in the Trinity Complex other than warping and uplift.« less
  • A core from the Lower Cretaceous middle Trinity aquifer of southern Kendall County, Texas, was analyzed to compare its petrographic and petrophysical properties to its hydraulic flow characteristics. The analyses helped determine flow intervals in the core. Flow intervals are defined as vertical zones having similar geologic (depositional and diagenetic) history, petrophysical properties, and hydraulic conductivity characteristics. The information gathered from the study of a single core may be integrated with similar data from other cores or well logs to define 'flow units.' Methodology involved visual and image analysis examination of thin sections and epoxy pore casts of samples tomore » evaluate pore geometry (pore size, pore throat size, pore interconnectivity, and pore throat size heterogeneity). Samples were thus grouped into pore-type families. Representative samples from each pore-type family were tested for air and brine permeability, porosity, and mercury injection capillary pressure. Pore throat size distributions obtained from the capillary pressure analyses were compared to the data derived from the pore casts and thin sections. Pore geometry evaluated correlated well with mercury capillary pressure data for the most permeable zone of the core. Geologically, this flow interval consists of a porous, medium-grained peloid grainstone that is characterized by large pores connected by large pore throats. Wherever present, such pore throat to pore body size ratios enhance flow through the rock. Correlation between pore geometry and capillary pressure data deteriorate in packstones with increasing micrite mud content and wackestones with increasing dolomitization. These lower correlations are due to decreasing pore throat size and increasing pore throat size heterogeneity in these rocks.« less
  • The rate of sea level rise likely has varied during the late Wisconsinan-Holocene transgression. The authors are investigating the sea level history of the northwest Gulf of Mexico by examining the sequence stratigraphy of incised valleys on the Texas continental shelf. Glaciologists argue that mass wasting of marine ice sheets can cause rapid and episodic relative sea level (RSL) rises on the order of 5 m/100 years. Such an event would produce a large (/approx/25 km) landward translation of the shoreline on low-gradient shelves like that of north Texas. RSL rise events are expected to be manifested as discontinuities inmore » valley-fill sedimentation and as changes in valley shape. Nearly 1000 km of high-resolution seismic profiles collected in an area extending from Sabine Pass to Galveston and to 60 km offshore were integrated with engineering borings, vibracores, and piston cores; these data allow mapping of incised valleys and valley-fill facies associated with the ancestral Sabine and Trinity rivers. An RSL rise event is characterized by a change from slow rate of rise to rapid and back to slow. The period of rapid rise produces a major flooding surface; bayhead delta development is suppressed, and lower estuarine or marine deposits lie directly on fluvial deposits. Because accommodation increases as rapidly as RSL rises, valley-fill deposition is limited to the original, deeply incised valley. In map view, the valley appears relatively straight and narrow. The valley just offshore Galveston Island represents this situation. During a period of slow rise, bayhead deltas prograde and downlap onto estuarine deposits. In this case, sediments may completely fill the original incised valley, and the river supplying this valley may meander beyond previous valley edges. In map view, such a valley will be broad and irregular in shape, much like modern Galveston Bay.« less