Compilation of Rb-Sr and 40Ar/39Ar age determinations obtained before 1984 indicate an almost complete age spectrum from 1800 Ma to 1000 Ma, but age clusters exist at similar to 1400 Ma, similar to 1100 Ma and 400-300 Ma, which have geological significance. Subdivision of older ages into discrete tectonic events was not justified from this data alone, but more recent U-Pb isotopic analysis of zircons, in rocks designated to particular structural/metamorphic events, has revealed a complex tectonic history in the 1880-1600 Ma interval. The northern and central provinces underwent major tectonism between 1780-1730 Ma, but much of the southern province was not deformed until similar to 1600 Ma. The younger history of the Inlier is characterised by several stages of uplift and isolated thermal (magmatic) events. Major Mesoproterozoic crustal exhumation (Anmatjira uplift phase) has been interpreted from widespread 1500-1400 Ma ages, including: regional-scale closure of 40Ar-39Ar systems in hornblende from mafic granulite; outcrop-scale Rb-Sr total rock isotopic systems in mylonitized granitoids; and Sm-Nd garnet-hornblende pairs in mylonitized amphibolites. A similar to 1150 Ma thermal event in the southern part of the Inlier (Teapot magmatic event) is recorded by intrusion of granite, pegmatites, and the alkaline Mordor Igneous Complex, and by isotopic resetting of Rb-Sr mineral systems. Dolerite dyke injection at similar to 1050 Ma reflects limited extensional tectonism that may have related to formation of the Amadeus Basin. The second major uplift event was the Alice Springs orogeny at 400-300 Ma, an unusual intracratonic, thick- and thin-skinned thrust event that involved limited retrograde amphibolite facies, but extensive greenschist facies metamorphism, and restricted pegmatite intrusion. Compilation of Rb-Sr and 40Ar/39Ar age determinations obtained before 1984 indicate an almost complete age spectrum from 1800 Ma to 1000 Ma, but age clusters exist at similar to 1400 Ma, similar to 1100 Ma and 400-300 Ma, which have geological significance. Subdivision of older ages into discrete tectonic events was not justified from this data alone, but more recent U-Pb isotopic analysis of zircons, in rocks designated to particular structural/metamorphic events, has revealed a complex tectonic history in the 1880-1600 Ma interval. The northern and central provinces underwent major tectonism between 1780-1730 Ma, but much of the southern province was not deformed until similar to 1600 Ma. The younger history of the Inlier is characterised by several stages of uplift and isolated thermal (magmatic) events. Major Mesoproterozoic crustal exhumation (Anmatjira uplift phase) has been interpreted from widespread 1500-1400 Ma ages, including: regional-scale closure of 40Ar-39Ar systems in hornblende from mafic granulite; outcrop-scale Rb-Sr total rock isotopic systems in mylonitized granitoids; and Sm-Nd garnet-hornblende pairs in mylonitized amphibolites. A similar to 1150 Ma thermal event in the southern part of the Inlier (Teapot magmatic event) is recorded by intrusion of granite, pegmatites, and the alkaline Mordor Igneous Complex, and by isotopic resetting of Rb-Sr mineral systems. Dolerite dyke injection at similar to 1050 Ma reflects limited extensional tectonism that may have related to formation of the Amadeus Basin. The second major uplift event was the Alice Springs orogeny at 400-300 Ma, an unusual intracratonic, thick- and thin-skinned thrust event that involved limited retrograde amphibolite facies, but extensive greenschist facies metamorphism, and restricted pegmatite intrusion. Compilation of Rb-Sr and 40Ar/39Ar age determinations obtained before 1984 indicate an almost complete age spectrum from 1800 Ma to 1000 Ma, but age clusters exist at similar to 1400 Ma, similar to 1100 Ma and 400-300 Ma, which have geological significance. Subdivision of older ages into discrete tectonic events was not justified from this data alone, but more recent U-Pb isotopic analysis of zircons, in rocks designated to particular structural/metamorphic events, has revealed a complex tectonic history in the 1880-1600 Ma interval. The northern and central provinces underwent major tectonism between 1780-1730 Ma, but much of the southern province was not deformed until similar to 1600 Ma. The younger history of the Inlier is characterised by several stages of uplift and isolated thermal (magmatic) events. Major Mesoproterozoic crustal exhumation (Anmatjira uplift phase) has been interpreted from widespread 1500-1400 Ma ages, including: regional-scale closure of 40Ar-39Ar systems in hornblende from mafic granulite; outcrop-scale Rb-Sr total rock isotopic systems in mylonitized granitoids; and Sm-Nd garnet-hornblende pairs in mylonitized amphibolites. A similar to 1150 Ma thermal event in the southern part of the Inlier (Teapot magmatic event) is recorded by intrusion of granite, pegmatites, and the alkaline Mordor Igneous Complex, and by isotopic resetting of Rb-Sr mineral systems. Dolerite dyke injection at similar to 1050 Ma reflects limited extensional tectonism that may have related to formation of the Amadeus Basin. The second major uplift event was the Alice Springs orogeny at 400-300 Ma, an unusual intracratonic, thick- and thin-skinned thrust event that involved limited retrograde amphibolite facies, but extensive greenschist facies metamorphism, and restricted pegmatite intrusion. Compilation of Rb-Sr and 40Ar/39Ar age determinations obtained before 1984 indicate an almost complete age spectrum from 1800 Ma to 1000 Ma, but age clusters exist at similar to 1400 Ma, similar to 1100 Ma and 400-300 Ma, which have geological significance. Subdivision of older ages into discrete tectonic events was not justified from this data alone, but more recent U-Pb isotopic analysis of zircons, in rocks designated to particular structural/metamorphic events, has revealed a complex tectonic history in the 1880-1600 Ma interval. The northern and central provinces underwent major tectonism between 1780-1730 Ma, but much of the southern province was not deformed until similar to 1600 Ma. The younger history of the Inlier is characterised by several stages of uplift and isolated thermal (magmatic) events. Major Mesoproterozoic crustal exhumation (Anmatjira uplift phase) has been interpreted from widespread 1500-1400 Ma ages, including: regional-scale closure of 40Ar-39Ar systems in hornblende from mafic granulite; outcrop-scale Rb-Sr total rock isotopic systems in mylonitized granitoids; and Sm-Nd garnet-hornblende pairs in mylonitized amphibolites. A similar to 1150 Ma thermal event in the southern part of the Inlier (Teapot magmatic event) is recorded by intrusion of granite, pegmatites, and the alkaline Mordor Igneous Complex, and by isotopic resetting of Rb-Sr mineral systems. Dolerite dyke injection at similar to 1050 Ma reflects limited extensional tectonism that may have related to formation of the Amadeus Basin. The second major uplift event was the Alice Springs orogeny at 400-300 Ma, an unusual intracratonic, thick- and thin-skinned thrust event that involved limited retrograde amphibolite facies, but extensive greenschist facies metamorphism, and restricted pegmatite intrusion. Compilation of Rb-Sr and 40Ar/39Ar age determinations obtained before 1984 indicate an almost complete age spectrum from 1800 Ma to 1000 Ma, but age clusters exist at similar to 1400 Ma, similar to 1100 Ma and 400-300 Ma, which have geological significance. Subdivision of older ages into discrete tectonic events was not justified from this data alone, but more recent U-Pb isotopic analysis of zircons, in rocks designated to particular structural/metamorphic events, has revealed a complex tectonic history in the 1880-1600 Ma interval. The northern and central provinces underwent major tectonism between 1780-1730 Ma, but much of the southern province was not deformed until similar to 1600 Ma. The younger history of the Inlier is characterised by several stages of uplift and isolated thermal (magmatic) events. Major Mesoproterozoic crustal exhumation (Anmatjira uplift phase) has been interpreted from widespread 1500-1400 Ma ages, including: regional-scale closure of 40Ar-39Ar systems in hornblende from mafic granulite; outcrop-scale Rb-Sr total rock isotopic systems in mylonitized granitoids; and Sm-Nd garnet-hornblende pairs in mylonitized amphibolites. A similar to 1150 Ma thermal event in the southern part of the Inlier (Teapot magmatic event) is recorded by intrusion of granite, pegmatites, and the alkaline Mordor Igneous Complex, and by isotopic resetting of Rb-Sr mineral systems. Dolerite dyke injection at similar to 1050 Ma reflects limited extensional tectonism that may have related to formation of the Amadeus Basin. The second major uplift event was the Alice Springs orogeny at 400-300 Ma, an unusual intracratonic, thick- and thin-skinned thrust event that involved limited retrograde amphibolite facies, but extensive greenschist facies metamorphism, and restricted pegmatite intrusion.
