Prospecting in the northern part of Sardinia, within a N-S-trending tectonic trough has led to the discovery of a number of mineralized sections in the bottom terrigenous sediments that were produced during a Miocene marine transgression. The mineralization occurs at the contact between pyroclastics and clastic sediments and consists of authigenic oxides and sulphides, suggesting fluctuations of redox conditions in a near-shore, high-pH environment. Evidence indicates that metals were transported under warm and semi-arid climatic conditions by ground waters and deposited in environments characterized by high pH and fluctuating Eh conditions. Evidence also suggests that mineralization occurred during diagenesis.
Authigenic Cu-carbonates in sandstones at he base of Miocene in the Logudoro Region (NW Sardinia, Italy)
Fadda S;Fiori M;Matzuzzi C
2003
Abstract
Prospecting in the northern part of Sardinia, within a N-S-trending tectonic trough has led to the discovery of a number of mineralized sections in the bottom terrigenous sediments that were produced during a Miocene marine transgression. The mineralization occurs at the contact between pyroclastics and clastic sediments and consists of authigenic oxides and sulphides, suggesting fluctuations of redox conditions in a near-shore, high-pH environment. Evidence indicates that metals were transported under warm and semi-arid climatic conditions by ground waters and deposited in environments characterized by high pH and fluctuating Eh conditions. Evidence also suggests that mineralization occurred during diagenesis.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
