The Upper Cretaceous Salitre intrusion, subdivided into Salitre I and Salitre II and dated to ~86-82 Ma by Sonoki and Garda (1988), is part of the Alto Paranaíba Igneous Province (APIP, Fig. 1) in Brazil, which is one of the largest ultrapotassic / carbonatitic / kimberlitic provinces in the world. The intrusion is characterized by the presence of lamproites, carbonatites and one lamprophyre (analyzed here), as well as along with a variety of intrusive cumulitic rocks.
Among the Salitre studied samples, this alkaline lamprophyre is characterized by low SiO2 (35.6 wt%), ultrapotassic (K2O/Na2O = 5; K2O = 4.4 wt%) and peralkaline (PI = 1.3). It exhibits variable MgO content (14 wt%) and is enriched in REEs (∑REE=~1,300 ppm) and other trace elements (Nb, Ta, Zr, Hf, Sr, Ba). This lamprophyre is characterized by olivine and phlogopite phenocrysts set in a fine-grained groundmass of clinopyroxene, apatite, phlogopite, magnetite, chromite, and perovskite, with rare titanite and garnet; kalsilite is absent.
Analyzing the trace elements of the main minerals in this lamprophyre helped us learn more about the origin and evolution of these magmas, as well as their possible genetic link with the other Salitre rocks. This analysis also provided important information about their enrichment in rare earth elements (REEs) and high field strength elements (HFSEs).
This publication results from work conducted under the transnational access/national open access action at Mass spectrometry la-icp laboratory (IGG-CNR, Italy) supported by WP3 ILGE - MEET project, PNRR - EU Next Generation Europe program, MUR grant number D53C22001400005.
The Drilling the Ivrea-Verbano zonE (DIVE) project, run as ICDP expedition 5071, aims at studying the lower continental crust (LCC) towards and across the Moho transition zone. The study area provides unique access to a section of the LCC with well-preserved structural relationships. Two drilling targets were selected from this zone for scientific investigations, which, in combination, reveal significant aspects of its geologic history. The goals of the project are primarily petrological-geochemical, geophysical, structural, microbiological, and focusing on natural gases. Two boreholes have been successfully drilled in project DIVE 1: first 5071_1_B near Ornavasso in 2022, then 5071_1_A in Megolo in 2023-2024.
This data publication provides the operational dataset of the ICDP project DIVE (ICDP 5071). The dataset is documented by the Explanatory Remarks (https://doi.org/10.48440/ICDP.5071.002).