Composition and Sm-Nd isotopic data of the lower crust beneath San Luis Potosí, central Mexico: Evidence from a granulite-facies xenolith suite

En el basalto alcalino de la mina de peridotita La Olivina (localizada ~150 km al SE de Chihuahua, Chih.), se encuentran granulitas y nódulos ultramáficos del manto superior o la corteza inferior bajo la forma de xenolitos. Estos xenolitos ultramáficos pertenecen a tres grupos que se diferencian por su composición de clinopiroxenos: grupo I, alto magnesio (Mg/Mg+ Fe=0.90) y alto Cr203; grupo II, moderado magnesio (Mg/Mg+ Fe=0.76), alto Al203 y alto TiO2; y grupo III, con composición intermedia entre I y II (grupo de transición). Los análisis de minerales primarios muestran que los xenolitos son similares a los de San Carlos, Arizona, E.U., Xalapasco de la Joya, San Luis Potosi, México y Kilburne Hole, New Mexico, E.U. Los xenolitos del manto de La Olivina perte- necen a tres grupos con distinta textura: grupo I, granoblástica (Â¿metamórfica?); grupo II, granular allotriomórfica (Â¿ígnea?); y grupo III, granular allotriomórfica (Â¿ígnea?) con algunas texturas porfiroclasticas (Â¿metamórfica?). Los xenolitos de corteza inferior de La Olivina son predominantemente gneises pelíticos y granulitos de piroxeno. Los gneises pelíticos presentan ensambles uniformes de granate + cuarzo + plagioclasa + sanidina + silimanita + rutilo + grafito. La mayoría de las granulitas de piroxeno tienen plagioclasa, aunque algunas presentan escapolita en vez de plagioclasa. Estas muestras del manto inferior son idénticas en ensamble de minerales y muy simi- lares en geoquímica a los xenolitos del Kilburne Hole. Las granulitas y los gneises peliticos tienen edades modelo de Nd de 1.1 a 1.2 m.a., usando un cociente inicial de condritas, o bien 1.6 m.a. si se usa el modelo de fuente empobrecida. La edad de 1.6 m.a. concuerda muy bien con las edades del Kilbourne Hole, de aquí que se extiendan bajo el norte de México, al menos hasta el área de La Olivina, rocas precámbricas cratónicas, similares en edad, historia metamórfica y composición de protolito a las que están bajo Kilbourne Hole.

Download Full-text

Geographic and Host Range of Meloidogyne spp. in North Central Mexico

Plant Disease ◽

10.1094/pdis.2001.85.4.445a ◽

2001 ◽

Vol 85 (4) ◽

pp. 445-445 ◽

Cited By ~ 1

Author(s):

R. Velásquez-Valle

Keyword(s):

Prunus Persica ◽

Central Mexico ◽

Root Knot Nematode ◽

Dry Bean ◽

North Central ◽

First Report ◽

San Luis ◽

San Luis Potosi ◽

Meloidogyne Spp ◽

San Luis Potosí

A disease survey carried out in 1998, 1999, and 2000 in the states of Aguascalientes, San Luis Potosí, and Zacatecas revealed the dispersal of Meloidogyne spp in this region of Mexico. Pepper (Capsicum annuum L.) Mirasol type plants showing general chlorosis, root rot, and galls were observed in central Zacatecas and western San Luis Potosí. Dry bean (Phaseolus vulgaris L.) plants (Landrace Flor de Mayo) collected in western San Luis Potosí and Aguascalientes also showed root galls. Roots of squash (Cucurbita spp) and sunflower (Helianthus annuus L.) plants that showed galled roots were found under dryland conditions in northern Zacatecas. Nursery peach (Prunus persica L.) plantlets with no foliar symptoms but showing severe root galling were detected in Zacatecas. Perineal patterns of Meloidogyne females obtained from those galled roots were coincident with those of M. incognita according to pictoral keys (1). This is the first report of M. incognita affecting these hosts in that region of the country. Alfalfa (Medicago sativa) plants collected in Aguascalientes showed galls caused by Meloidogyne spp; this is the first report of this nematode affecting alfalfa in the state. Volunteer onion (Allium cepa L., ‘Grano Blanco’) plants growing in a squash field in eastern Zacatecas had galled roots; a few Meloidogyne spp. females were obtained from small galls. This is the first report of the root-knot nematode affecting onion plants in north central México. Onion is known to be a host for several species of this nematode (2). Stunted, chlorotic squash plants had roots severely galled by Meloidogyne spp, but pepper crops growing in the same field in previous years showed general chlorosis, reduced size, and poor yield did not have root galls. References: (1) Eisenback, J. D., et al. 1983. Guia para la identificación de las cuatro especiales más comunes del nematodo agallador (Meloidogyne spp.) con una clave pictorica. International Meloidogyne Project, Raleigh, NC. (2) Schwartz, H. F., and Mohan, S. K. 1995. Compendium of onion and garlic diseases. American Phytopathological Society. St. Paul. MN.

Download Full-text

Strontium isotopes and mobility of a Columbian mammoth (Mammuthus columbi) population, Laguna de las Cruces, San Luis Potosí, México

Geological Magazine ◽

10.1017/s001675681500103x ◽

2016 ◽

Vol 153 (4) ◽

pp. 743-749 ◽

Cited By ~ 6

Author(s):

VÍCTOR ADRIÁN PÉREZ-CRESPO ◽

PETER SCHAAF ◽

GABRIELA SOLÍS-PICHARDO ◽

JOAQUÍN ARROYO-CABRALES ◽

LUIS M. ALVA-VALDIVIA ◽

...

Keyword(s):

Dental Enamel ◽

Strontium Isotopes ◽

The Other ◽

Central Mexico ◽

Isotopic Ratios ◽

San Luis ◽

San Luis Potosi ◽

Leaching Procedure ◽

San Luis Potosí

AbstractBy using strontium isotopic ratios of dental enamel from molars, we were able to reconstruct the migration context for three individuals of a Columbian mammoth population (Mammuthus columbi) around Laguna de las Cruces, San Luis Potosí, central México. A three-step leaching procedure was applied to eliminate secondary Sr contributions in the molar enamel. One of the studied individuals showed 87Sr/86Sr ratios similar to those obtained from soils and plants from Laguna de las Cruces and was identified as local, whereas the other two mammoths had different molar 87Sr/86Sr values, indicative of migration and mobility contexts.

Download Full-text

Counterclockwise rotations in the Late Eocene–Oligocene volcanic fields of San Luis Potosí and Sierra de Guanajuato (eastern Mesa Central, Mexico)

Tectonophysics ◽

10.1016/j.tecto.2014.10.015 ◽

2014 ◽

Vol 637 ◽

pp. 289-304 ◽

Cited By ~ 4

Author(s):

Louis Andreani ◽

Jerôme Gattacceca ◽

Claude Rangin ◽

Juventino Martínez-Reyes ◽

François Demory

Keyword(s):

Late Eocene ◽

Central Mexico ◽

San Luis ◽

San Luis Potosi ◽

Volcanic Fields ◽

San Luis Potosí

Download Full-text

Medical therapeutic itineraries of women with breast cancer diagnosis affiliated to the People's Health Insurance in San Luis Potosí, central Mexico

Cadernos de Saúde Pública ◽

10.1590/0102-311x00009114 ◽

2015 ◽

Vol 31 (1) ◽

pp. 60-70 ◽

Cited By ~ 3

Author(s):

Luz María Tejada-Tayabas ◽

Liseth Amell Salcedo ◽

Joel Monárrez Espino

Keyword(s):

Breast Cancer ◽

Health Insurance ◽

Screening Program ◽

Cancer Control ◽

Diagnostic Process ◽

Central Mexico ◽

Diagnose Breast Cancer ◽

San Luis ◽

San Luis Potosi ◽

San Luis Potosí

This study aims to describe the medical itineraries followed by breast cancer women affiliated to the People's Health Insurance in San Luis Potosí, central Mexico. We used an ethnographic approach based on oral histories of 12 women diagnosed with breast cancer in the year prior to the first meeting. Two face-to-face sessions per participant lasting 60 minutes each were conducted followed by a telephone interview. Content and diachronic analyses were used. Three main itineraries were identified: (1) diagnostic process, (2) final diagnosis to treatment, and (3) cancer control and relapse. Findings suggested that infrastructure and human resources to adequately screen and timely diagnose breast cancer were scant and insufficiently trained, respectively. Deferral of medical assessment was related with lack of information about breast cancer consequences, with women being afraid of a positive result, and with economic constraints. The current screening program needs to be redesigned to prevent diagnostic delays, as these seem to explain the high frequency of advanced stages reported at the time of diagnosis.

Download Full-text