USE OF ROCK WEATHERING-RIND THICKNESS FOR HOLOCENE ABSOLUTE AGE-DATING IN NEW ZEALAND
USE OF ROCK WEATHERING-RIND THICKNESS FOR HOLOCENE ABSOLUTE AGE-DATING IN NEW ZEALAND
复制标题
利用岩石风化壳厚度进行新西兰全新世绝对年龄测定
DOI：
10.1080/00040851.1981.12004224
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
T. Chinn
中科院分区：
文献类型：
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作者：
T. Chinn
新西兰托莱斯超群砂岩表面巨石上的风化外皮随着时间的推移而变厚。果皮的生长速度是通过放射性碳测年沉积物的年龄控制来确定的。该速率呈指数衰减，表明风化是由反应物通过果皮的扩散速率决定的。因此，风化层厚度提供了一种确定表面年龄的方法，其中年龄（年）= 1030 R1 24，R 是沉积物表面上约 50 块巨石的模态外皮厚度（以毫米为单位）。除时间外，还有许多因素影响果皮的生长速度：最重要的两个因素是颗粒大小和变质程度。较粗粒的岩石会加速外皮生长，而较细粒的岩石和较高的变质程度会抑制外皮的生长。对上怀马卡里里流域的冰碛进行的果皮厚度测量有助于建立该地区的全新世冰川年代学。冰斗冰川前进的时间为0至430年、1000至2500年、4000年和7600至9500年BP。
Weathering rinds on surface boulders of the Torlesse Supergroup sandstones of New Zealand thicken with time. The rate of rind growth has been determined using age control from radiocarbon dated deposits. The rate decays exponentially, suggesting that the weathering is determined by rates of diffusion of reactants through the rind. Weatheringrind thicknesses thus provide a means of determining the age of surfaces where age (years) = 1030 R1 24 and R is modal rind thickness in millimeters of about 50 boulders on the surface of the deposit. A number of factors besides time affect the rate of growth of rinds: the two most important were found to be grain size and degree of metamorphism. Accelerated rind growth occurs on coarser grained rocks, while rind growth is inhibited in finer grained rocks and by higher metamorphic grade. Rind thickness measurements on moraines in the Upper Waimakariri Catchment help to establish a Holocene glacial chronology for the area. Times of cirque glacier advance are 0 to 430, 1000 to 2500, 4000, and 7600 to 9500 yr BP.