选择和使用合适的示踪指标，是揭示岩溶地区红色风化壳物质来源的关键。
To select and adopt the proper tracing index is the key to constrain the origin of red weathering crusts in karst areas.
在某些特殊情形下，可以利用天然示踪物的质量守衡原理来获得物质输运信息。
Nevertheless, in some circumstances, natural tracers can provide information on transport, on the basis of a mathematical model.
并且，由于铜是主要成矿元素之一，所以铜同位素对于成矿物质来源和成矿过程的示踪更为直接。
Moreover, as one of major ore-forming elements, copper isotope composition can directly trace ore-metal source and ore-forming process.
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