“Dyke swarms of Tandil and Azul”的意思、由来-开放百科全书

The dyke swarms of Tandil and Azul are groups of dykes of Proterozoic age located in Buenos Aires Province, Argentina. The dyke swarms consists of two groups: 2000 million year old dykes of calc-alkaline type and 1600 million year old dykes of tholeiitic type.^[1]

The tholeiitic dykes are made up of diabase and titanium-rich basalt, in contrast the calc-alkaline dykes are made up of andesite and rhyolite.^[2] The dyke swarms intrude the southern part of the Río de la Plata Craton, much the same way the Uruguayan dyke swarms intrude the northeastern part of the craton.^[1]

The calc-alkaline dykes intruded during a period of transtensional tectonics during the Transamazonian Orogeny while the tholeiitic dykes intruded during the period of extensional tectonics that succeeded the orogeny.^[1]

References

1. ^¹²{{cite journal |last=Iacumin |first=M. |last2=Piccirillo |first2=E.M. |last3=Girardi |first3=V.A.V. |last4=Teixeira |first4=W.|last5=Bellieni |first5=G. |last6=Echeveste |first6=H.|last7=Fernández |first7=R. |last8=Pinese |first8=J.P.P. |last9=Ribot |first9=A. |date=2001 |title=Early proterozoic calc-alkaline and middle proterozoic tholeiitic Dyke Swarms from Central–Eastern Argentina: petrology, geochemistry, Sr–Nd isotopes and tectonic implications |url= |journal=Journal of Petrology |publisher= |volume=42 |issue=11 |pages= 2109–2143 |doi= |access-date= }}
2. ^{{cite journal |last=Lajoinie |first=M.F. |last2=Etcheverry |first2=R.O |last3=Lanfranchini |first3=M.E. |last4=Cábana |first4=C. |date=2014 |title=Geología, geoquímica y génesis de diques proterozoicos del área de San Miguel, sierras septentrionales de la provincia de Buenos Aires. |url=http://ppct.caicyt.gov.ar/index.php/raga/article/view/2210 |journal=Revista de la Asociación Geológica Argentina |language=Spanish |publisher= |volume=71 |issue=3 |pages=404–415 |doi= |access-date= }}