Archean diamonds from Wawa (Canada): samples from deep cratonic roots predating cratonization of the Superior Province

  title={Archean diamonds from Wawa (Canada): samples from deep cratonic roots predating cratonization of the Superior Province},
  author={T Stachel and Anetta Banas and Karlis Muehlenbachs and Stephan Kurszlaukis and Edward C. Walker},
  journal={Contributions to Mineralogy and Petrology},
With an age of ca. 2.7 Ga, greenschist facies volcaniclastic rocks and lamprophyre dikes in the Wawa area (Superior Craton) host the only diamonds emplaced in the Archean available for study today. Nitrogen aggregation in Wawa diamonds ranges from Type IaA to IaB, suggesting mantle residence times of tens to hundreds of millions of years. The carbon isotopic composition (δ13C) of cube diamonds is similar to the accepted mantle value (− 5.0‰). Octahedral diamonds show a slight shift (by + 1.5… Expand
Vanished diamondiferous cratonic root beneath the Southern Superior province: evidence from diamond inclusions in the Wawa metaconglomerate
We studied diamonds from a 2.697–2.700 Ga Wawa metaconglomerate (Southern Superior craton) and identified mineral inclusions of high-Cr, low-Ca pyrope garnet, low-Ti Mg-chromite, olivine (Fo93), andExpand
Ages of syngenetic inclusions of peridotitic (P-type) and eclogitic (E-type) minerals in diamond show that episodes of diamond formation in the subcontinental lithospheric mantle correlate withExpand
Diamonds through Time
Diamonds form in the upper mantle during episodic events and have been transported to the Earth’s surface from at least the Archean to the Phanerozoic. Small diamonds occur as inclusions in robustExpand
The origin of cratonic diamonds — Constraints from mineral inclusions
Abstract The origin of cratonic diamonds is reviewed on the basis of nearly 5000 analyses of silicate, oxide and sulphide inclusions in diamonds. Compositional fields are defined for common mineralsExpand
Diamonds in the Attawapiskat area of the Superior craton (Canada): evidence for a major diamond-forming event younger than 1.1 Ga
Abstract Here, we compare nitrogen aggregation characteristics and carbon isotopic compositions in diamonds from Mesoproterozoic (T1) and Jurassic (U2) kimberlites in the Attawapiskat area—the firstExpand
Diamond ages from Victor (Superior Craton): Intra-mantle cycling of volatiles (C, N, S) during supercontinent reorganisation
Abstract The central Superior Craton hosts both the diamondiferous 1.1 Ga Kyle Lake and Jurassic Attawapiskat kimberlites. A major thermal event related to the Midcontinent Rift at ca. 1.1 Ga inducedExpand
Geochemistry and radiogenic isotope characteristics of xenoliths in Archean diamondiferous lamprophyres: Implications for the Superior Province cratonic keel
Abstract Xenoliths retrieved from lamprophyric hosts in the Michipicoten belt fall into four groups defined by Al–Mg contents but do not include mantle peridotite. Based on immobile trace elementExpand
Small Mantle Fragments from the Renard Kimberlites, Quebec: Powerful Recorders of Mantle Lithosphere Formation and Modification Beneath the Eastern Superior Craton
The origin and evolution of diamondiferous lithospheric mantle sampled by the Neoproterozoic Renard kimberlites (eastern Superior Province, Quebec) is constrained based on mantle-derivedExpand
Petrology and Nd–Hf Isotope Geochemistry of the Neoproterozoic Amon Kimberlite Sills, Baffin Island (Canada): Evidence for Deep Mantle Magmatic Activity Linked to Supercontinent Cycles
The c. 673 Ma (U^Pb rutile) Amon kimberlites located in northern Baffin Island intruded Late Archean basement rocks of the Rae craton as a subhorizontal sill complex.The Amon sills are part ofExpand
Diamondiferous Archean rocks of the Olondo greenstone belt (western Aldan–Stanovoy shield)
Abstract Diamond from metaultramafic rocks of the Mesoarchean (2.96–3.0 Ga) Olondo greenstone belt, located in the western Aldan–Stanovoy shield, has been studied. Diamonds occur in lenses ofExpand


Archean calc-alkaline lamprophyres of Wawa, Ontario, Canada: Unconventional diamondiferous volcaniclastic rocks
Abstract Unusual diamondiferous rocks are found in the Wawa subprovince of the Southern Superior Craton. They are dated at 2.67–2.7 Ga and comprise part of a calc-alkaline volcanic sequence of theExpand
Three generations of diamonds from old continental mantle
INCLUSION-BEARING diamonds erupted by kimberlites are time capsules from the sub-continental mantle. Diamonds with peridotitic mineral inclusions ('peridotitic diamonds') from Cretaceous kimberlitesExpand
Multiple-mineral inclusions in diamonds from the Snap Lake/King Lake kimberlite dike, Slave craton, Canada: a trace-element perspective
Abstract Multiple inclusions of minerals in diamonds from the Snap Lake/King Lake kimberlites of the southeastern Slave craton in Canada have been analyzed for trace elements to elucidate theExpand
Peridotitic diamonds from Namibia: Constraints on the composition and evolution of their mantle source
About half the diamonds studied from the Cenozoic placer deposits along the Namibian coast belong to the peridotitic suite. The peridotitic mantle source is heterogeneous ranging from lherzolitic toExpand
Diamonds in volcaniclastic komatiite from French Guiana
The world's main sources of non-alluvial diamonds are found in ultrapotassic kimberlite or lamproite diatremes (pipes filled with explosive volcanic debris), most of which have Phanerozoic ages andExpand
Unusual mineral inclusions and carbon isotopes of alluvial diamonds from Bingara, eastern Australia
Abstract A suite of diamonds from eastern Australia, “Group B”, are essentially eclogitic. However, mineral inclusion compositions are unlike eclogitic diamonds from other occurrences. Garnets areExpand
Diamond formation and source carbonation: mineral associations in diamonds from Namibia
Mineral inclusions in diamonds from Namibia document a range of mantle sources, including eclogitic, websteritic and peridotitic parageneses. Based on unusual textural features a group of inclusionsExpand
Diamondiferous lithospheric roots along the western margin of the Kalahari Craton—the peridotitic inclusion suite in diamonds from Orapa and Jwaneng
The Orapa and Jwaneng kimberlites are located along the western margin of the Kalahari Craton and the prevalence of eclogitic over peridotitic diamonds in both mines has recently been linked to lowerExpand
Inclusions in diamonds from the K14 and K10 kimberlites, Buffalo Hills, Alberta, Canada: diamond growth in a plume?
Analyses of mineral inclusions, carbon isotopes, nitrogen contents and nitrogen aggregation states in 29 diamonds from two Buffalo Hills kimberlites in northern Alberta, Canada were conducted. FromExpand
Eclogitic diamonds of Proterozoic age from Cretaceous kimberlites
DIAMONDS with eclogitic inclusions ('eclogitic diamonds') from the Premier kimberlite and Argyle lamproite were previously shown to be of Proterozoic age1–3 and distinct in origin from peridotiticExpand