[揽瓜阁精读] 246. 鉴定雕塑

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题材-艺术-现象解释
结构-讲述某个博物馆可以购买一个雕塑，但不知道具体年代。通过同位素探测年代，同时讲述其表层的钙物质无法提供断代信息。
第一段：a statue was offered to a museum to buy:
- Told some facts about the statue: larger-than-life marble figure of a youth, two-meter-tall, well perservered
- The owner was asking for a higher price
第二段：identify the quarry from which the stone came:
- Can be done with great precision, by isotopic detection
- Analyzed by the research group. The marble probably came from the Cape Vathy quarries
第三段：the ratio of oxygen and carbon ruled out the artifical replication
- Compare the ratio of oxygen 16 to 18, and the ratio of carbon 12 to 13 in the statue curst with the fresh dolomite from the interior
- Ruled out the possibility of artifical replication or precipitation out of groundwater
第四段：the thickness of the calcite crust does not indicate an exact age
- Tell the reason why: depends on many factor
- Consistent with a wide range: from several centuries to more than several millennia