(Updates at 0550 GMT)

By Rae Wee

SINGAPORE, Oct 8 (Reuters) - Mainland Chinese stocks

returned from an extended break with a roaring start on Tuesday,

though the optimism did not spill into regional share markets as

Beijing fell short on delivering more details of its massive

stimulus.

Hong Kong stocks, in particular, tumbled on Tuesday,

reversing some of the rally they enjoyed while China's markets

were closed for the week-long National Day holiday.

China's CSI300 blue-chip index surged 10% in early

trade to its strongest since July 2022, while the Shanghai

Composite Index jumped roughly the same amount to its

highest mark since December 2021.

But Hong Kong's Hang Seng Index slid 7.6%, with the

Hang Seng Mainland Properties Index falling more than

10%.

That left MSCI's broadest index of Asia-Pacific shares

outside Japan down 2.2%.

"I think the movement today basically just explains that in

the Chinese onshore market, it's just rising to a level that

investors are comfortable with. And in Hong Kong, there may be a

bit of a profit-taking or breaking even move," said Gary Ng, a

senior economist at Natixis.

Mainland shares also erased some of their early gains over

the course of the trading day, after the chairman of China's

economic planner Zheng Shanjie provided little detail of how the

country plans to roll out its support measures at a closely

watched press conference on Tuesday.

That disappointed investors, especially those who were

hoping for more specifics on fiscal measures to stimulate the

ailing Chinese economy.

The CSI300 index was last up 4.3%, while the

Shanghai Composite Index retreated slightly to last

trade 3.34% higher.

"Markets were hoping to obtain some guidance on the size of

fiscal stimulus at this presser - but with MoF (Ministry of

Finance) not in attendance, it was unlikely this information was

going to be provided," said Rong Ren Goh, a portfolio manager at

Eastspring Investments.

"What's next? No major press briefing lined up so far. Thus,

it is likely we see markets consolidating and digesting what has

already been announced, which arguably is meaningful, but not

quite enough to satiate lofty expectations."

Fears of a widening conflict in the Middle East also sapped

bullish sentiment after Hezbollah on Monday fired rockets at

Israel's third-largest city, Haifa, and Israel looked poised to

expand its offensive into Lebanon, one year after the

devastating Hamas attack on Israel that sparked the Gaza war.

Stock futures fell broadly, with EUROSTOXX 50 futures

sliding 1%, while FTSE futures ticked 0.6%

lower.

S&P 500 futures lost 0.03% and Nasdaq futures

fell 0.07%.

Elsewhere, Tokyo's Nikkei fell more than 1%.

In commodities, oil prices pared some of their gains after

jumping on Monday due to worries about supply disruptions, with

Brent crude futures last down 1.5% at $79.74 a barrel.

It had surged above $80 a barrel for the first time in more

than a month in the previous session.

U.S. crude futures shed 1.54% to $75.95 a barrel.

FED BETS

In the broader market, investors were reassessing the

outlook for the path of the Federal Reserve's easing cycle after

Friday's blockbuster U.S. jobs report.

Any chance of another 50-basis-point rate cut next month has

been erased and traders are pricing in a 12% chance the Fed

could keep rates on hold. Just 50 bps worth of cuts are priced

in by December.

Expectations of a less-aggressive Fed trajectory kept the

benchmark 10-year U.S. Treasury yield above 4% in

Asia trade.

The two-year U.S. Treasury yield hovered near its

highest level in over a month and last stood at 3.9499%.

"While confidence about another 50-bp cut is justifiably

dampened ... the Fed rate cut cycle is far from derailed," said

Vishnu Varathan, head of macro research for Asia ex-Japan at

Mizuho Bank.

"Admittedly, the all-around blockbuster jobs report is

justifiable cause to reassess overzealous 'pivot bets' on

front-loaded, outsized cuts."

Still, the U.S. dollar failed to get a further lift on the

revised Fed expectations, having already had a strong run last

week, in part because of safe-haven gains linked to escalating

tensions in the Middle East.

The dollar was on the back foot, falling 0.17% against the

Japanese yen to 147.95, while sterling rose

0.06% to $1.30925.

Against a basket of currencies, the greenback eased 0.08% to

102.40, though it hovered near a seven-week high hit on Friday.

Meanwhile, the onshore yuan played catch-up and

slid against the dollar which had gained ground following

Friday's jobs report. The yuan was last 0.76% lower at 7.0650

per dollar.

Elsewhere, spot gold was little changed at $2,644.70

an ounce.