Tesis (licenciatura en derecho)--Universidad Nacional Autónoma de México. / Bibliography: p. 113-115.

No description available.

Thesis (Ph. D.)--University of California, Berkeley, 1994. / Includes bibliographical references (leaves 278-325).

The geology of the Sierra Mojada silver-lead-zinc mining district gives new insights into the stratigraphic evolution of the Coahuila Block and the Coahuila Folded Belt and the history of deformation along the basement-rooted San Marcos Fault Zone. Sierra Mojada provides the opportunity for substantial data collection relevant to the interaction of regional tectono-stratigraphic elements in a generally data-poor region of northeastern Mexico. Active mineral exploration has produced an extensive database of closely spaced drill core. Expansive underground workings facilitate subsurface geologic mapping. Sierra Mojada is situated at the northwestern edge of two tectono-stratigraphic provinces, the Coahuila Block, to the south, and the Coahuila Folded Belt, to the north. The San Marcos Fault, a west-northwest-trending regional structure extends through Sierra Mojada and is the informal boundary between these two provinces. Sierra Mojada is situated on uplifted and deformed late Paleozoic Ouachita siliciclastic strata intruded by Triassic diorites. This basement is diagnostic of the Coahuila Block. Basement rocks are overlain by an immature conglomerate that is interpreted to be the updip equivalent of the Jurassic La Casita Formation. The stratigraphy of Sierra Mojada principally consists of a continuous succession of Barremian through Albian carbonates unconformably overlying the basal conglomerate. The Barremian-Aptian Cupido Formation locally records deepening conditions from a clastic-influenced evaporitic interior to high energy, open water conditions. The shale and lime mudstone of the La Pena Formation were deposited during a Gulf-wide transgression that signals the end of the Aptian. The Sierra Mojada region of the Coahuila Block was inundated throughout the Aptian and was affected by the late Aptian transgression. The Albian Aurora Formation constitutes the bulk of the Cretaceous section. Sierra Mojada exposes the Aurora shelf rim, progressing from platform margin to shelf rim and platform interior facies. The structural features of Sierra Mojada affect the entire Cretaceous section. The high angle San Marcos Fault was reactivated with reverse motion during the Paleogene as a result of Laramide shortening. This juxtaposed basement and Jurassic conglomerate against the Cretaceous carbonates consistent with offset observed along the southern trace of the San Marcos Fault. A local colluvial unit suggests a lag in Laramide deformation. The carbonate strata and colluvial unit were overridden by a low angle, northeast-dipping thrust fault that placed a Neocomian through Aptian sequence atop the autochthonous Aptian-Albian carbonates. The allochthonous San Marcos Formation suggests regional-scale tectonic transport of this immature fluvial conglomerate from a downdip depozone within the Sabinas Basin. Kinematic indicators are consistent with the southwest-northeast axis for maximum compression established for Paleogene shortening throughout the Coahuila Folded Belt. The thrust fault bisects the principal ore zone within the Lower Aurora and upper La Pena Formations. This relation constrains the minimum age of ore emplacement to the Paleogene and suggests mineralization was genetically tied to the late stages of the Laramide Orogeny. / text

Source: Masters Abstracts International, Volume: 47-06, page: 3544. Advisers: Maria E. Fernandez; Belinda M. Reininger. Includes bibliographical references.

This dissertation addresses key questions that are yet to be answered related to the involvement of local patrons in the decoration of northern New Spanish churches. The case study of the Jesuits' church of San Ignacio in Santa María de las Parras (located in present-day Coahuila, Mexico) reveals new evidence that prominent Spanish and Tlaxcaltecan Indian benefactors participated in the adornment of private devotional chapels in this religious space. In Parras, the Jesuits and secular landowners cultivated vineyards and participated in the lucrative business of viticulture that transformed this mission settlement by the mid-seventeenth century into a thriving winemaking center. As the Jesuits created their own "spiritual economy" in Parras on the northeastern frontier, they fostered alliances with Spanish and Tlaxcaltecan vineyard owners to serve both their religious and temporal interests (Chapter One). The surviving evidence of artworks and inventories reveals that these benefactors donated funds to decorate their own chapels in San Ignacio. This financial support helped the Jesuits purchase and import paintings by prominent artists working in Mexico City for display in their Parras church. While these patrons selected the iconographies of the artworks they funded, the Jesuits also arranged their chapels in a carefully ordered sequencing of images to promote devotions that were commensurate with Ignatian spirituality (Chapter Two). To shed more light on the process in which the Jesuits coordinated the circulation of devotional images from Mexico City to Parras, this study will examine travel logs to document the mobility of the Jesuits and their frequent movement between metropolitan settings and the northern frontier. By tracking the circulation of individuals as well as artworks, it is possible to uncover how the Society's process of fostering relationships with donors operated in Parras just as it did in larger cities such as Mexico City, Lima, Cuzco, and Rome (Chapter Three). Vineyard metaphors that resonated with special symbolic meaning at Parras also took on a new relevance when martyrdom became an omnipresent subject in the wake of Indian revolts. Evangelization on the frontiers of the Christian world became integral to the Jesuits' formation of their missionary identity in both New Spain and Europe. This study will present evidence of rare martyrdom drawings produced in Mexico and transported to Rome that played an active role in transforming the importance of the New Spanish frontier and catalyzed the creation of new artworks in Mexico City and Rome (Chapter Four). The evidence uncovered in this study has important implications for the field of colonial art history, as it reveals that art production in Parras was not an isolated missionary phenomenon but rather part of a dynamic network of artistic patronage and cultural exchange that moved in both directions between Europe and New Spain. This re-contextualizing of center-periphery paradigms further demonstrates that metropolitan and frontier relationships were not always opposed to each other, but rather interacted within a larger network of artistic dialogue. / History of Art and Architecture

The Sierra Mojada district consists of multiple types of mineral concentrations ranging from polymetallic sulfide deposits, "non-sulfide Zn" (NSZ) deposits, and a Pb carbonate deposit hosted by Upper Jurassic to Lower Cretaceous carbonates. This study focuses on the two non-sulfide Zn deposits, the Smithsonite Manto and the Iron Oxide Manto, that occur south of the San Marcos fault. The Smithsonite Manto shows karst features, including internal sediments interbanded with smithsonite (ZnCO₃). The Iron Oxide Manto consists of strata-bound zones dominantly of hemimorphite (Zn₄Si₂O₇ (OH)₂·H₂O) that fills pores in Fe-oxides. The mineralogy of the NSZ mineralization consists of smithsonite, hemimorphite and Zn clays (sauconite) associated mainly with calcite and Mn-Fe-oxides. Zn clays are abundant in the Smithsonite Manto, but no Zn clays have been found in the Iron Oxide Manto. This project attempts to constrain the origin of the NSZ concentrations through petrographic and mineralogical study of major Zn-bearing minerals, and their carbon and oxygen stable isotopes and Pb isotope geochemistry. Smithsonite in the Smithsonite Manto occurs as botryoidal aggregates consisting of scalenohedral or rhombohedral microcrystals and banded colloform or massive smithsonite in open spaces, whereas smithsonite in the Iron Oxide Manto occurs as rhombic microcrystals grown in pore spaces or finely intergrown with Fe-oxides. Both Fe-poor and Fe-rich smithsonite are found in the Iron Oxide Manto. Under optical-CL, smithsonite displays complex growth zoning that can be related to variable trace element content. Trace elements semiquantitatively analyzed using LA-ICP-MS show that most blue luminescent smithsonite has lower Mn contents than pink to bright red luminescent zones in smithsonite. Preliminary fluid inclusion petrography in hemimorphite and calcite suggests that fluid composition can be related to precipitation of NSZ minerals from freshwater to slightly saline waters. Calculated salinities for two phase (liquid +vapor) and single phase (liquid) inclusions in hemimorphite range between 0.0 and 1.6 wt. % NaCl equivalent, and salinities of inclusions in calcite were between 0.0 and 1.1 wt. % NaCl equivalent. The oxygen isotope values for smithsonite are relatively constant (avg. [delta]¹⁸O[subscriptVSMOW] = 21.9 ± 0.5[per mille]), whereas [delta]¹³C[subscriptVPDB] values range from -8.4 to -1.1 [per mille]. The oxygen isotope values in late calcite are within the same range of smithsonite, whereas the average values of the carbon isotope are lower by 5 [per mille]. Formational temperature of smithsonite is calculated to be between 26 ~ 40 °C using the modern groundwater composition at Cuatro Ciénegas. Similar Pb isotopic compositions of smithsonite and cerussite to galena suggest the source of metals in the NSZ deposits presumably originate from the sulfide deposits. / text