Commodities prices slid on Thursday, ​led by silver, part of a ‍broad market sell-off as investors reversed an earlier rush for hard assets after global geopolitical tensions eased.

Silver tumbled as much as 15 per cent and oil prices ‍fell ​more than US$1 a barrel after the U.S. and Iran agreed to hold talks, and after a positive telephone call between the leaders of the U.S. and China.

Commodities joined other financial markets such as shares in lurching lower as some of ⁠the speculative heat came out of markets that had been propelled to record peaks.

“Sentiment (has) turned soggy across most asset classes…, with losses feeding into one another and creating a self-reinforcing feedback loop amid thin market liquidity,” said Christopher Wong, a ‌strategist at OCBC.

Adding pressure ‍to commodities was a stronger dollar, which climbed to a ‍two-week high.

A firmer dollar index makes commodities priced ‌in the U.S. currency more expensive for buyers using ⁠other currencies.

Spot gold retreated from a near one-week high and ​spot silver plummeted. Last week, gold climbed to a record US$5,594.82 an ounce and silver to an all-time high of US$121.64.

“We saw extreme volatility in precious metals and other commodities this week, and what we are witnessing today are some aftershocks,” said ​Tony Sycamore, an analyst at broker IG.

Oil prices fell, but held close to multi-month highs as investors kept a close eye on the progress of Iran talks, worried that a military conflict could disrupt supply from the key Middle East producing region.

Copper moved further from record highs hit last week on ⁠concern over demand and rising stocks in warehouses registered with the London ⁠Metal Exchange.

The metal widely used in power and construction had rebounded from a two-session slump, supported ‌by China’s plan to expand its copper strategic reserves.

Soybeans bucked the trend, climbing to a two-month high, boosted by comments by President Donald Trump that China is considering buying cargoes from the U.S.

Iron ore fell 2 per cent, weighed down by high inventories.