Determining the Impactor of the Ordovician Lockne Crater: Oxygen Isotopes in Chromite versus Sedimentary Pge

Determining the impactor of the Ordovician Lockne crater: Oxygen and neon isotopes in chromite versus sedimentary PGE signatures

a Department of Geology, Sölvegatan 12, Lund University, SE-22362 Lund, Sweden b Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA c Department of Geoscience, University of Wisconsin, 1215 W. Dayton St., Madison, WI 53706, USA d Robert A. Pritzker Center for Meteoritics and Polar Studies, Department of Geology, The Field Museum of N...

Determining the impactor of the Ordovician Lockne

Podiform Chromitites in the Sorkhband Ultramafic Complex, Southern Iran: Evidence for

The podiform chromitite deposits of the Ordovician Sorkhband ultramafic complex, southwestern Makran, are the largest chromitite deposits in Iran. The Sorkhband ultramafic complex comprises of a northern part of dunite, podiform chromitite, olivine clinopyroxenite, wehrlite and olivine websterite and a southern part of foliated diopsidic harzburgite with subordinate dunite, olivine clinopyroxen...

High-precision Oxygen Three-isotope Sims Analyses of Ordovician Extraterrestrial Chromite Grains from Sweden and China: Debris of the L Chondrite Parent Asteroid Breakup

EXTRATERRESTRIAL CHROMITE GRAINS FROM SWEDEN AND CHINA: DEBRIS OF THE L CHONDRITE PARENT ASTEROID BREAKUP P. R. Heck, T. Ushikubo, B. Schmitz, N. T. Kita, M. J. Spicuzza and J. W. Valley, Wisc-SIMS, Department of Geology and Geophysics, University of Wisconsin, 1215 W. Dayton St., Madison, WI 53706, USA, [email protected], Department of Geology, University of Lund, Sölvegatan 12, SE-22362 Lund, ...

A Non-magmatic Iron Meteorite as Impactor for the Rochechouart Crater

The Rochechouart impact crater in the French Massif Central, has a diameter of 20 25 km [1] and an age of 250 my [2]. The cater is deeply eroded, down to the crater floor. Impact melt outcrops can be found in different parts of the crater [3]. The type of impactor that produced Rochechouart crater is still not clear. The first proposal of an IIA iron asteroid was based on the abundance of some ...