EARTH AND PLANETARY SCIENCE LETTERS Volume 112, number 1 /4, August 1992 CONTENTS (Abstracted / indexed in: Bulletin Signalétique, Chemical Abstracts, Current Contents, Geo Abstracts and GEOBASE, INSPEC, Mineralogical Abstracts, PASCAL / CNRS, PHYS / Physics Briefs and AGI’s Bibliography and Index of Geology) Physical and climatic parameters which influence the air content in polar ice P. Martinerie, D. Raynaud, D.M. Etheridge, J.-M. Barnola and D. Mazaudier Paleomagnetic calibration of Milankovitch cyclicity in Lower Cretaceous sediments T.D. Herbert Paleomagnetism of Cretaceous to lower Tertiary rocks from Southwestern Sichuan: a revisit K. Huang and N.D. Opdyke Paleomagnetic study of an arcuate fold belt developed on a marginal orogen: The Cajamarca deflection, northern Peru P. Mitouard, C. Laj, T. Mourier and C. Kissel The relations between faulting and mafic magmatism in the Altiplano—Puna plateau (central Andes) R. Marrett and $S.H. Emerman Disequilibrium partial melting model and its implications for trace element fractionations during mantle melting Zhenwei Qin The volatile element enrichment of chondritic interplanetary dust particles E.K. Jessberger, J. Bohsung, S. Chakaveh and K. Traxel Inheritance of silicate differentiation during lunar origin by giant impact P.H. Warren The heat and fluid transfer associated with the flanges on hydrothermal venting structures A.W. Woods and J.R. Delaney Elevated K/T palaeotemperatures throughout Northwest England: three kilometres of Tertiary erosion? C.L.E. Lewis, P.F. Green, A. Carter and A.J. Hurford Simple shear experiments on magnetized wax—hematite samples J.-P. Cogné and S. Canot-Laurent Resolving an isotopic boundary within the Australian—Antarctic Discordance D.G. Pyle, D.M. Christie and J.J. Mahoney Pulsating diapiric flows: Consequences of vertical variations in mantle creep laws P. van Keken, D.A. Yuen and A. van den Berg Large uplift of rift flanks: A genetic link with lithospheric rigidity? J. Chéry, F. Lucazeau, M. Daigniéres and J.P. Vilotte Discussion Comment on “The nature, distribution and genesis of the coesite and stishovite associated with the pseudotachylite of the Vredefort Dome, South Africa” by J.E.J. Martini W.U. Reimold, W.P. Colliston and T. Wallmach Reply to the comment of W.U. Reimold et al. on ‘The nature, distribution and genesis of the coesite and stishovite associated with the pseudotachylite of the Vredefort Dome, South Africa”’ J.E.J. Martini Authors may accompany their manuscripts with floppy disks Please see the notes on the inside back cover and the guide at the back of this issue. Authors are requested to submit a completed checklist with each diskette. Additional copies of the guide and the checklist are available from the publisher. Please ensure that the disk version and the hardcopy are identical— discrepancies can lead to publication of the wrong version - All authors are strongly encouraged to include with their manuscripts the facsimile number where they may be contacted. Communication by facsimile can greatly assist in speeding publication. - Please note that with immediate effect all accepted manuscripts should be accompanied by a set of copies of figures and tables as well as the original camera-ready versions.