02303nas a2200241   4500000000100000008004100001653002000042653004200062653001600104653002800120100001700148700002100165700002000186700001900206700001500225700001600240245019400256856005100450300002200501490001200523520151200535022001402047       2012                            d10aclay mineralogy10adiffuse reflectance spectrophotometry10aIndus Shelf10amagnetic susceptibility1 aDavid Limmer1 aCornelia Köhler1 aStephen Hillier1 aSteven Moreton1 aAli Tabrez1 aPeter Clift00aChemical weathering and provenance evolution of Holocene \textendash Recent sediments from the Western Indus Shelf , Northern Arabian Sea inferred from physical and mineralogical properties  uhttp://dx.doi.org/10.1016/j.margeo.2012.07.009  a101\textendash1150 v326-3283 a<p>We present a multi-proxy mineral record based on X-ray diffraction and diffuse reflectance spectrophotometry analysis for two cores from the western Indus Shelf in order to reconstruct changing weathering intensities, sediment transport, and provenance variations since 13 ka. Core Indus-10 is located northwest of the Indus Canyon and exhibits fluctuations in smectite/(illite + chlorite) ratios that correlate with monsoon intensity. Higher smectite/(illite + chlorite) and lower illite crystallinity, normally associated with stronger weathering, peaked during the Early\textendashMid Holocene, the period of maximum summer monsoon. Hematite/goethite and magnetic susceptibility do not show clear co-variation, although they both increase at Indus-10 after 10 ka, as the monsoon weakened. At Indus-23, located on a clinoform just west of the canyon, hematite/goethite increased during a period of monsoon strengthening from 10 to 8 ka, consistent with increased seasonality and/or reworking of sediment deposited prior to or during the glacial maximum. After 2 ka terrigenous sediment accumulation rates in both cores increased together with redness and hematite/goethite, which we attribute to widespread cultivation of the floodplain triggering reworking, especially after 200 years ago. Over Holocene timescales sediment composition and mineralogy in two localities on the high-energy shelf were controlled by varying degrees of reworking, as well as climatically modulated chemical weathering.</p>  a0025-3227