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311.金矿
P1 - Metals found in the lake mud of PA revealed the 1st evidence for pre-colonial metalsmithing.
P2 - Illustrate a way that archaeologists can recreate the past. e.g. a tax hint imposes switching copper production to silver.
P3 - Pre-colonial bronze artifacts have been found dating back to 1000AD, after the fall of the largest empire in the Andes before the Incas. It was unclear how metallurgy had developed.
P4 - CC: There is a lot you can't tell because there's been a lot of looting.
Curious emergence of metallurgy
P1 - To recreate the metallurgical history, the scientists measure the concentrations of copper and etc in sediments from a lake in Peru that metal pollutants from furnace smoke contaminated.
P2 - The metals that CC, MA and their colleagues focused on are each linked with certain metallurgical practices. They used carbon dating and lead isotope dating to identify when the metals were deposited.
P3 - The earliest metallurgy dated back to between 1000 and 1200AD. Then metallurgy aimed towards copper.
P4 - CC: it is strange that the onset of metallurgy occurred just as the wari empire disappeared.
Transition to silver
P1 - The wari collapsed at the same time as the tiwanaku dropped lake titicaca.
CC: still a mystery
P2 - After 1450AD, switched from copper to silver. It's coincided with Inca control, when rulers imposed a tax payable in silver.
P3 - CC: they hope to reconstruct the history of metallurgy and have collected more samples for further analysis.
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