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Directory of Open Access Journals Sweden. A study was conducted on the larval composition of the family Chironomidae in an Andean stream in Uspallata locality Mendoza, Argentina. Physical and chemical variables were measured in both the field and the laboratory. Relationship between presence and abundance of chironomids and environmental parameters was explored using a Canonical Correspondence analysis. Seven genera were identified. Rubinstein, Nora A.
The Paramillos de Uspallata deposit, previously considered as genetically linked to a Miocene porphyry deposit, is located in the Mesozoic Cuyo Basin, which was formed during the beginning of the break-up of Gondwana. In the present study, both previous information and new geological, mineralogical, and isotopic data allowed outlining a new descriptive model for this deposit.
Stratigraphic and structural controls allowed considering this deposit as contemporaneous with the Mesozoic rifting, with the mineralization resulting from a Pb-Zn stage followed by an Ag-Cu-Pb stage. The hydrothermal fluids were found to have low temperature and low to moderate salinity, and to result from the mixing between metamorphic and meteoric fluids, with the lead sourced by the igneous Paleozoic basement and the sulfur partly derived from a magmatic source.
These characteristics allow describing Paramillos de Uspallata as Pb-Zn-Ag veins hosted in clastic sedimentary sequences genetically linked to a rift basin and redefining it as detachment-related mineralization.
Friedman, Jonathan M. We excavated 29 buried living woody plants and used burial signatures in their annual rings to date stratigraphy in four trenches across the arroyos.